This is the history of the fourth day's work, the creating of the sun, moon, and stars, which are here accounted for, not as they are in themselves and in their own nature, to satisfy the curious, but as they are in relation to this earth, to which they serve as lights; and this is enough to furnish us with matter for praise and thanksgiving. Holy Job mentions this as an instance of the glorious power of God, that by the Spirit he hath garnished the heavens (Job 26:13); and here we have an account of that garniture which is not only so much the beauty of the upper world, but so much the blessing of this lower; for though heaven is high, yet has it respect to this earth, and therefore should have respect from it. Of the creation of the lights of heaven we have an account,

I.In general, Gen 1:14, Gen 1:15, where we have 1. The command given concerning them: Let there be lights in the firmament of heaven. God had said, Let there be light (Gen 1:3), and there was light; but this was, as it were, a chaos of light, scattered and confused: now it was collected and modelled, and made into several luminaries, and so rendered both more glorious and more serviceable. God is the God of order, and not of confusion; and, as he is light, so he is the Father and former of lights. Those lights were to be in the firmament of heaven, that vast expanse which encloses the earth, and is conspicuous to all; for no man, when he has lighted a candle, puts it under a bushel, but on a candlestick (Luk 8:16), and a stately golden candlestick the firmament of heaven is, from which these candles give light to all that are in the house. The firmament itself is spoken of as having a brightness of its own (Dan 12:3), but this was not sufficient to give light to the earth; and perhaps for this reason it is not expressly said of the second day's work, in which the firmament was made, that it was good, because, till it was adorned with these lights on the fourth day, it had not become serviceable to man. 2. The use they were intended to be of to this earth. (1.) They must be for the distinction of times, of day and night, summer and winter, which are interchanged by the motion of the sun, whose rising makes day, his setting night, his approach towards our tropic summer, his recess to the other winter: and thus, under the sun, there is a season to every purpose, Ecc 3:1. (2.) They must be for the direction of actions. They are for signs of the change of weather, that the husbandman may order his affairs with discretion, foreseeing, by the face of the sky, when second causes have begun to work, whether it will be fair or foul, Mat 16:2, Mat 16:3. They do also give light upon the earth, that we may walk (Joh 11:9), and work (Joh 9:4), according as the duty of every day requires. The lights of heaven do not shine for themselves, nor for the world of spirits above, who need them not; but they shine for us, for our pleasure and advantage. Lord, what is man, that he should be thus regarded! Psa 8:3, Psa 8:4. How ungrateful and inexcusable are we, if, when God has set up these lights for us to work by, we sleep, or play, or trifle away the time of business, and neglect the great work we were sent into the world about! The lights of heaven are made to serve us, and they do it faithfully, and shine in their season, without fail: but we are set as lights in this world to serve God; and do we in like manner answer the end of our creation? No, we do not, our light does not shine before God as his lights shine before us, Mat 5:14. We burn our Master's candles, but do not mind our Master's work.

II.In particular, Gen 1:16-18.

1.Observe, The lights of heaven are the sun, moon, and stars; and all these are the work of God's hands. (1.) The sun is the greatest light of all, more than a million times greater than the earth, and the most glorious and useful of all the lamps of heaven, a noble instance of the Creator's wisdom, power, and goodness, and an invaluable blessing to the creatures of this lower world. Let us learn from Psa 19:1-6 how to give unto God the glory due unto his name, as the Maker of the sun. (2.) The moon is a less light, and yet is here reckoned one of the greater lights, because though, in regard to its magnitude and borrowed light, it is inferior to many of the stars, yet, by virtue of its office, as ruler of the night, and in respect of its usefulness to the earth, it is more excellent than they. Those are most valuable that are most serviceable; and those are the greater lights, not that have the best gifts, but that humbly and faithfully do the most good with them. Whosoever will be great among you, let him be your minister, Mat 20:26. (3.) He made the stars also, which are here spoken of as they appear to vulgar eyes, without distinguishing between the planets and the fixed stars, or accounting for their number, nature, place, magnitude, motions, or influences; for the scriptures were written, not to gratify our curiosity and make us astronomers, but to lead us to God, and make us saints. Now these lights are said to rule (Gen 1:16, Gen 1:18); not that they have a supreme dominion, as God has, but they are deputy-governors, rulers under him. Here the less light, the moon, is said to rule the night; but in Psa 136:9 the stars are mentioned as sharers in that government; The moon and stars to rule by night. No more is meant than that they give light, Jer 31:35. The best and most honourable way of ruling is by giving light and doing good: those command respect that live a useful life, and so shine as lights.

2.Learn from all this, (1.) The sin and folly of that ancient idolatry, the worshipping of the sun, moon, and stars, which, some think, took rise, or countenance at least, from some broken traditions in the patriarchal age concerning the rule and dominion of the lights of heaven. But the account here given of them plainly shows that they are both God's creatures and man's servants; and therefore it is both a great affront to God and a great reproach to ourselves to make deities of them and give them divine honours. See Deu 4:19. (2.) The duty and wisdom of daily worshipping that God who made all these things, and made them to be that to us which they are. The revolutions of the day and night oblige us to offer the solemn sacrifice of prayer and praise every morning and evening.

And God said, Let there be lights, etc. - One principal office of these was to divide between day and night. When night is considered a state of comparative darkness, how can lights divide or distinguish it? The answer is easy: The sun is the monarch of the day, which is the state of light; the moon, of the night, the state of darkness. The rays of the sun, falling on the atmosphere, are refracted and diffused over the whole of that hemisphere of the earth immediately under his orb; while those rays of that vast luminary which, because of the earth's smallness in comparison of the sun, are diffused on all sides beyond the earth, falling on the opaque disc of the moon, are reflected back upon what may be called the lower hemisphere, or that part of the earth which is opposite to the part which is illuminated by the sun: and as the earth completes a revolution on its own axis in about twenty-four hours, consequently each hemisphere has alternate day and night. But as the solar light reflected from the face of the moon is computed to be 50,000 times less in intensity and effect than the light of the sun as it comes directly from himself to our earth, (for light decreases in its intensity as the distance it travels from the sun increases), therefore a sufficient distinction is made between day and night, or light and darkness, notwithstanding each is ruled and determined by one of these two great lights; the moon ruling the night, i.e., reflecting from her own surface back on the earth the rays of light which she receives from the sun. Thus both hemispheres are to a certain degree illuminated: the one, on which the sun shines, completely so; this is day: the other, on which the sun's light is reflected by the moon, partially; this is night. It is true that both the planets and fixed stars afford a considerable portion of light during the night, yet they cannot be said to rule or to predominate by their light, because their rays arc quite lost in the superior splendor of the moon's light.

And let them be for signs - לאתת leothoth. Let them ever be considered as continual tokens of God's tender care for man, and as standing proofs of his continual miraculous interference; for so the word את oth is often used. And is it not the almighty energy of God that upholds them in being? The sun and moon also serve as signs of the different changes which take place in the atmosphere, and which are so essential for all purposes of agriculture, commerce, etc.

For seasons - מועדים moadim; For the determination of the times on which the sacred festivals should be held. In this sense the word frequently occurs; and it was right that at the very opening of his revelation God should inform man that there were certain festivals which should be annually celebrated to his glory. Some think we should understand the original word as signifying months, for which purpose we know the moon essentially serves through all the revolutions of time.

For days - Both the hours of the day and night, as well as the different lengths of the days and nights, are distinguished by the longer and shorter spaces of time the sun is above or below the horizon.

And years - That is, those grand divisions of time by which all succession in the vast lapse of duration is distinguished. This refers principally to a complete revolution of the earth round the sun, which is accomplished in 365 days, 5 hours, 48 minutes, and 48 seconds; for though the revolution is that of the earth, yet it cannot be determined but by the heavenly bodies.

And let them be for lights in the firmament of the heaven,.... To continue there as luminous bodies; as enlighteners, as the word signifies, causing light, or as being the instruments of conveying it, particularly to the earth, as follows:

to give light upon the earth; and the inhabitants of it, when formed:

and it was so: these lights were formed and placed in the firmament of the heaven for such uses, and served such purposes as God willed and ordered they should.

FOURTH DAY. (Gen 1:14-19)

let there be lights in the firmament--The atmosphere being completely purified, the sun, moon, and stars were for the first time unveiled in all their glory in the cloudless sky; and they are described as "in the firmament" which to the eye they appear to be, though we know they are really at vast distances from it.