Light and Nur in the Quran: Sun and Moon

Why does the question of light and nur arise?

Someone goes out on a moonlit night and can see the way, then goes out at noon and can scarcely keep their eyes open. Both scenes are so familiar that the question can disappear: where did this light come from, and how does the Moon’s brightness differ from the Sun’s radiation? Reading God’s words, “He is the One who made the Sun a radiance and the Moon a light, and determined stages for it so that you may know the number of years and the reckoning” [Yunus: 5], adds a third question: what does the verse actually say, and what knowledge acquired later do we bring to it?

On pages 140–143 of «قل سيروا في الأرض فانظروا كيف بدأ الخلق», Ahmed Alhafiz moves from sunlight, the spectrum and the photon to the solar cell and silicon, then draws a clear boundary between created radiation and God’s words, “God is the Light of the heavens and the earth” [al-Nur: 35]. This article pauses at precisely that junction: how can we understand Quranic words through exegesis and light through physics without making either field a copy of the other?

The Sun as diyaʾ and the Moon as nur: what did commentators say?

The verse in Yunus begins with a reminder of the Creator, measured ordering and benefit, rather than a lesson on sources of illumination: “And determined stages for it so that you may know the number of years and the reckoning. God created that only in truth.” Light is present, but so are time, reckoning and purpose. Al-Tabari’s commentary on Yunus: 5 explains the Sun as a radiance by day and the Moon as a light by night, then discusses the Moon’s stages by which the passing of months is known. He does not tie his explanation of the two words to the mechanism by which photons are generated or reflected.

Ibn Ashur’s commentary on the verse describes diyaʾ as strong, brilliant light and nur as broader, applying to both weak and strong rays. He notes that Arabic words can overlap in use until it becomes difficult to assign each an uncrossable boundary. This offers an appropriate reading of the verse’s contrast: a Sun by which things are seen during the day and a Moon whose light is useful at night, with an evident difference in strength and function. Ibn Ashur takes both descriptions as pointing to wisdom and blessing in their creation before explaining the stages in detail.

Another passage says: “And made the Moon a light within them, and made the Sun a lamp” [Nuh: 16]. In his commentary on it, Ibn Ashur explains the lamp as an emphatic simile that brings the Sun within the listener’s understanding through a familiar lamp. He then sees the Moon’s description as light as an allusion to its reflection of sunlight, writing from his own exegetical and scientific horizon. This is an important interpretation, but it does not license the assertion that every Quranic use of nur means reflected light. In his commentary on Yunus, he explicitly says that nur is broader than diyaʾ. Reflection as a physical phenomenon is established by investigating the Moon and Sun, rather than simply turning a rhetorical contrast into a strict technical definition.

In al-Furqan the two images appear together again: “And placed in it a lamp and an illuminating moon” [al-Furqan: 61]. Illuminating moves from the noun light to the act of lighting that people experience at night, while lamp returns to the image of the Sun as it appears to those addressed. Reading Yunus, Nuh and al-Furqan together therefore gives us expressions in which observation, gratitude and rhetoric coexist, rather than a technical dictionary of celestial bodies. Al-Tabari’s commentary on al-Furqan: 61 identifies the lamp as the Sun; the force of the contrast emerges from the whole context, rather than an isolated word.

God’s words, “And made a blazing lamp” [al-Nabaʾ: 13], evoke powerful illumination and heat through an image the imagination can grasp. Lamp does not here report that the Sun is an oil lamp, just as blazing is not a nuclear-fusion equation. The simile conveys a perceptible meaning; explaining the energy mechanism remains a question for physics. Precision therefore requires us to preserve the distinction between the language of revelation and laboratory discoveries, and not to fear sound scientific observations when reading the universe.

Where does sunlight come from, and why do we see the Moon?

The Sun is a star. In its interior, quantities of hydrogen become helium through a series of nuclear-fusion reactions that release energy. Energy moves through its layers by complex processes, and electromagnetic radiation of multiple wavelengths then reaches us from its surface. Calling the Sun the source of moonlight does not mean that the Moon does not interact with light: its surface absorbs some and scatters and reflects some, and the part reaching our eyes produces the bright appearance. This differs from chemically burning wood and from the simplistic claim that the Sun is a ball of fire like a stove fire. NASA’s Sun facts and its explanation of moonlight allow this scientific picture to be checked.

NASA explains that the Moon does not produce its own visible light, and that what we call moonlight is reflected sunlight. Nevertheless, its surface is relatively dark: on average it returns about a tenth of the incident light to space, and appears bright to us because it is close to Earth. The Moon is not a perfect mirror returning a ray exactly as it arrived, and its dazzling whiteness is not evidence that its rocks are white: much of its soil and rock is dark gray. The difference between appearance and source teaches a lesson in observation: something can illuminate our view while receiving its light from elsewhere. This is an observation about nature, rather than an exclusive interpretation of a Quranic word.

Why does the Moon’s shape change, and how does this relate to its stages?

Sunlight illuminates roughly half the Moon at any moment. As the Moon orbits Earth, however, we see different portions of its illuminated half during the month: a crescent, then a quarter, then a full moon, followed by waning. This periodic change does not require Earth’s shadow to fall on the Moon every night; Earth’s shadow explains a lunar eclipse under a particular alignment. Because the Moon’s orbit is tilted relative to the plane of Earth’s orbit around the Sun, an eclipse does not occur at every full moon. NASA’s account of Moon phases and its answer about the Earth-shadow confusion explain the distinction.

The rhythm of the phases makes the words “And determined stages for it so that you may know the number of years and the reckoning” [Yunus: 5] broader than light alone. People observe the change, use it to recognize the passing of the lunar month, and organize social and religious appointments and practices accordingly. “And the Moon: We determined stages for it until it returned like the old date stalk” [Ya-Sin: 39] depicts the shrinking visible crescent at the cycle’s end. Exegesis attends to the benefit for reckoning, while astrophysics explains the geometry that makes the illuminated face appear in these forms. A correct geometric explanation does not turn the verse’s words into nothing more than an orbital diagram, just as measured ordering does not make calculation and observation unnecessary.

One detail deserves attention: commentators discuss stages of the Moon observed at positions in the sky, with the succession of the month read through its changing light. Astronomy distinguishes about 27.3 days to complete an orbit relative to the stars from about 29.5 days from one new moon to the next. Earth itself has advanced in its orbit around the Sun, so the Moon needs additional time to return to the same relative position with it. These are average durations describing two connected phenomena, rather than numbers encoded in the word stages. This distinction prevents us from confusing the Moon’s observed positions with its phase cycle and explains why reckoning naturally accompanies observation. NASA: Moon phases and the two orbital periods.

You can test part of this account by watching the sky: record the Moon’s appearance time, position and shape over successive nights, then compare your observations with a phase chart. You are observing, measuring and correcting your understanding, rather than extracting a law from nur alone. This connection between observation and reckoning matters in the Siru fi al-Ard project: moving from a familiar view to a testable question, then from the result of testing to humility before the world’s order.

What is light in the language of physics?

The light the eye detects is part of the electromagnetic spectrum, which also includes infrared, ultraviolet, radio waves and other radiation. A photon’s energy is related to its frequency by E = hf, and frequency is related to wavelength in a vacuum by c = λf. A violet-light photon therefore generally has more energy than a red-light photon, while ultraviolet photons have more energy than visible ones. But the brightness we perceive is not determined by a single photon’s energy alone: photon numbers, spectral distribution, eye sensitivity and viewing conditions are other factors. NASA’s introduction to the spectrum and its visible-light explanation place visible radiation in this framework.

These equations help us ask how a spectrometer maps light, why a solar cell responds to photons appropriate to the semiconductor’s energy, or how an optical fiber carries a signal. They belong to the thread followed by the book on pages 140–142: radiation, then interaction with matter, then a device and technology. But light in E = hf is a specific subject: radiation whose frequency and energy can be measured. The equation cannot be transferred to every occurrence of nur in Arabic or the Quran, just as scientific inquiry cannot be stopped at the boundary of a beautiful literary metaphor.

A familiar example clarifies the limits of concepts: we say that a lamp illuminated the room, and that an idea illuminated an issue. In the first statement, radiation flow and the eye’s response can be measured; the second describes understanding by reference to the experience of sight. A sound comparison does not make the idea a bundle of photons, and the comparison is not invalid because it is not a laboratory experiment. The breadth of nur in the Quran goes deeper than this simple example, but it teaches us to ask about context before selecting an explanatory tool.

“God is the Light of the heavens and the earth”: why does the question change here?

The Verse of Light opens a different inquiry from the reflection of sunlight on the Moon’s surface: “God is the Light of the heavens and the earth. The likeness of His light is as a niche in which there is a lamp” [al-Nur: 35]. At the parable’s conclusion: “Light upon light. God guides to His light whom He wills, and God sets forth parables for people.” A niche, lamp, glass and oil are familiar objects from people’s lives, followed by a transition to parable and guidance. Removing that transition and reading the verse as a definition in an optics textbook would lose its trajectory.

Al-Tabari explains the opening in terms of guidance for the inhabitants of the heavens and earth, presents other views, then favors the Quran in the believer’s heart as the meaning of the niche image, considering the clear verses preceding it and the guidance in its context. Ibn Ashur explains the multiple meanings of nur according to context, even distinguishing the word’s meaning at the opening from its meaning in the likeness of His light. This is more than a linguistic maneuver: the context itself mentions the sending down of verses, then expressly speaks of guidance and parable. God also says of revelation: “But We made it a light by which We guide whom We will of Our servants” [al-Shura: 52]. This light directs you toward truth and action; a wavelength meter does not detect it.

The construction of the parable itself deserves reflection: the niche is the lamp’s setting, the glass makes the light appear with exceptional clarity, and the oil almost shines, followed by “Light upon light.” Al-Tabari records views on the pronoun’s referent in “The likeness of His light” and on what the niche and lamp signify, favoring Quranic guidance in the believer’s heart. We therefore do not assign the image’s elements definitively, as though each part were an organ of the human body or a component of an optical device. It is a composite image serving the meaning of guidance, and its interpretive history testifies to its depth, rather than its exhaustion by a single scientific interpretation.

Discussion of God’s names and attributes remains a profound theological matter whose questions are not settled hastily or by a scientific instrument. We respect the verse’s wording as given, note commentators’ different explanatory approaches, and do not claim that those who speak of God’s guidance have reduced the divine attribute to a merely human convention. The boundary relevant to our inquiry is clear: electromagnetic light is a subject of research into God’s creations, whereas God, exalted is He, is not described as photons, a wave or a luminous body whose properties can be measured in a laboratory. This explains the book’s distinction between physical light and nur in the context of guidance and manifestation, while preserving the reverence and breadth the text allows.

Someone may understand light’s movement and skillfully make a useful device, then use that device for good or harm. Ethical inquiry does not change the speed of light; it asks who benefits from knowledge and who bears the consequences of its use. At the end of this section of the book, Ahmed Alhafiz returns to taskhir, the making of creation available for use: turning sunlight into electricity or light in fibers into information gives people tools without releasing them from gratitude and justice. Inquiry here widens from understanding a mechanism to responsibility for action.

Does the verse precede the discovery that moonlight is reflected?

One often hears: the Sun is diyaʾ because it produces light, and the Moon is nur because it reflects it; this is literally what the two words mean. The astronomical conclusion is correct for visible light, but the unrestricted linguistic claim is not. Al-Tabari explains the Sun’s and Moon’s effects by day and night; Ibn Ashur notes diyaʾ’s intensity and nur’s breadth in Yunus, then sees an allusion to reflection in Nuh. Text, exegesis and observation are three levels of explanation. Naming each properly preserves the verse’s beauty, the commentator’s interpretive judgment, and the experiment’s evidence.

Try the proposed rule in another context: if nur always means reflected light, how does the Quran describe revelation as light, and how should we understand “God guides to His light whom He wills”? This shows why a sound religious argument cannot depend on fixing one physical meaning for a word wherever it occurs. Believers can reflect on the appropriateness of the two descriptions in Yunus, mention science’s discoveries about the Moon, and leave each kind of evidence within its limits. This reading is firmer than a quick miracle claim that collapses when its proponent is asked about another use of the word.

From source to eye: why is luminous not enough?

Place black fabric and a white sheet under the same lamp and they look different. The source is the same, but the material absorbs some light and reflects some, while the eye and brain determine our perception of the result. The Moon similarly appears light against a black sky, whereas close images reveal a relatively dark surface. In the atmosphere, the Sun’s apparent color changes near the horizon through light scattering; its core has not changed energy sources at sunset. Separating source, surface, medium and observer prevents a whole scene from being reduced to a single attribute.

This is why the spectrometer was revolutionary: it separates radiation into wavelengths and reads absorption and emission lines for traces of interaction between light and atoms or materials. When page 141 of the book discusses learning something of stars’ composition, temperature and motion from their light, it does not mean that a ray tells a story in human language. An observable physical trace reaches us, and inferences are constructed by comparing models and measurements. Light here carries information about matter, but does not itself carry an ethical judgment about how we use that information. NASA: visible light and spectroscopy explains this field.

Returning to the verse after these details, we find that scientific inquiry can deepen our perception of the phenomenon’s precise order, while exegesis safeguards the direction of the address: creation in truth, stages for reckoning, and signs for people who know. The first does not compress the second, and the second does not insert unstated equations into the verse. This is the strength of the path proposed by the book in connecting knowledge with taskhir: reliable knowledge describing what is created, and responsible awareness in its use.

From sunlight to a device in human hands

The book’s trajectory does not end with explaining the sky. Solar cells show how radiation reaching Earth can become a practical capability: a semiconductor absorbs photons appropriate to its band gap, generating charge carriers, and the cell’s structure and internal field help separate them and collect an electric current. Light does not magically turn into electricity here; energy and matter interact under specified conditions. A cell does not absorb every photon in the same way, and does not deliver energy without losses. Page 142 of the book describes this sequence from photon to electron–hole pair to current, then connects silicon with the circuits of the digital age. The US Department of Energy’s account of cell efficiency and losses can be consulted.

The iron, fire and light investigation explores the passage from matter and energy to industry in greater detail. Here the idea concerns the moment of transformation: a measured photon, responsive matter, and a person who makes something and chooses its use. Calculating cell efficiency requires data and experiment; reading the Verse of Light requires language, context, exegesis and reverence for God. Although both paths meet in human beings, each path’s tools remain suited to the purposes for which they were developed.

Knowledge is not socially neutral in its effects merely because its physical law is the same. Lighting a home or operating a medical device has an evident benefit, but energy production involves materials, costs, consumption and distribution. The verse does not decide energy policy in people’s place; the book’s question of taskhir instead holds us accountable for what we do after learning how things work. Someone who sees the Sun as a blessing yet disregards people’s rights to benefit safely and fairly from knowledge has not completed the journey from inquiry to action.

Frequently asked questions

In brief, what is the difference between light and nur in the Quran?

The contrast “The Sun a radiance and the Moon a light” [Yunus: 5] shows a difference in intensity and benefit. Ibn Ashur describes diyaʾ as brilliant light and nur as broader. But nur’s meaning changes with context: it occurs in discussion of the Moon, revelation and guidance, so one physical definition cannot be imposed on it throughout the verses.

Does the Quran explicitly say that the Moon reflects sunlight?

The two verses mentioned do not contain an explicit physical statement such as reflects rays. Astronomy establishes that visible moonlight is reflected sunlight, and Ibn Ashur saw an allusion to this in Nuh: 16. The distinction between the verse’s wording, a commentator’s interpretation, and a scientific measurement supporting a description of the phenomenon matters.

Does moonlight originate in the Moon itself?

The visible moonlight we see comes mainly from sunlight striking the surface and then being reflected or scattered toward Earth. The Moon also emits infrared thermal radiation because it has a temperature; NASA’s lunar instruments measure reflected solar radiation and emitted thermal radiation separately. It is therefore more precise to qualify the claim by its visible appearance, rather than exaggerate by saying that the Moon emits no radiation at all.

Are Moon phases caused by Earth’s shadow?

Ordinary phases result from changes in the portion we see of the Moon’s sunlit half as it orbits Earth. Earth’s shadow affects the Moon during a lunar eclipse, rather than at every crescent, quarter and full moon. This explains the practical connection between successive phases, the Moon’s stages and reckoning.

Is the blazing lamp verbal evidence of nuclear fusion?

The description conveys the intensity of the Sun’s illumination and heat to people and suits what they observe. Nuclear fusion is a scientific explanation of the energy source in the Sun’s interior, supported by physics and observation. It is not the linguistic meaning of lamp, and the verse should not be bound to details of a physical model it did not explicitly state.

Does God being the Light of the heavens and earth mean physical light?

God, exalted is He, is not created radiation or photons. The Verse of Light has different theological and exegetical readings; its context prominently includes parable, guidance and clear verses. We treat the divine wording respectfully and read its interpretation in context, without transferring laboratory measurements intended for material light to it.

Why does Qul Siru fi al-Ard connect light with silicon?

Pages 140–143 follow a path from the photon to its effects on matter: a solar cell absorbs appropriate light, separates charges and generates current, while semiconductor circuits depend on controlling current. The aim is not to claim that the verse in Yunus explains a transistor, but to show how knowledge of creation’s laws becomes practical use, benefit and responsibility.

Conclusion: what does science illuminate, and what does the verse guide us toward?

When we see a bright Moon, the eye alone is not enough to establish the source of its illumination; inquiry takes us to the Sun, surface, geometry and observation. When we read the verse in Yunus, taking out nur and leaving the rest is not enough: it contains the ordering of stages, reckoning and creation in truth. And when we reach the Verse of Light, we cannot carry a spectrometer to measure guidance or define the reality of the divine essence.

The reader thus returns to the book’s pages, rather than an unrelated subject appended to it. Material light opens a path to understanding one of creation’s mechanisms; guidance teaches people not to confuse capability with self-sufficiency, or knowledge with arrogance. As their observation of radiation, cells and the sky becomes more precise, they have still greater reason to read the text more carefully and use what they have learned more justly.

References and documentation locations

1. Ahmed Alhafiz, «قل سيروا في الأرض فانظروا كيف بدأ الخلق», chapter four, pp. 140–143: light, the spectrum, the Sun, silicon, and the distinction between physical light and nur in the context of guidance. Book page.
2. The Quran: Yunus: 5, Nuh: 16, al-Furqan: 61, al-Nabaʾ: 13, Ya-Sin: 39, al-Nur: 35, al-Shura: 52.
3. Al-Tabari, Jamiʿ al-Bayan, commentary on Yunus: 5, al-Furqan: 61 and al-Nur: 35, distinguishing the Sun-and-Moon context from that of guidance and parable.
4. Ibn Ashur, al-Tahrir wa-l-Tanwir, commentary on Yunus: 5, Nuh: 16 and al-Nur: 35, on the breadth of nur, the suitability of the contrast and the exegetical readings.
5. NASA Science, Moonlight, Moon Phases and Top Moon Questions, on reflected moonlight, phases and their distinction from eclipses.
6. NASA Science, Sun Facts, Introduction to the Electromagnetic Spectrum, Visible Light and Wave Behaviors, on solar fusion, the spectrum and light’s interaction with matter.
7. NASA Science, Spectroscopy 101: Types of Spectra and How Absorption and Emission Spectra Work, on reading spectral lines.
8. US Department of Energy, Solar Photovoltaic Performance and Efficiency Basics, on cell losses and efficiency; NASA Open Data, Diviner lunar radiometer dataset, distinguishing emitted thermal radiation from sunlight reflected by the Moon.