What did God create on the fourth day?

Answer 1

God created the Sun, Moon and the Stars.

See the Genesis excerpt below.

Genesis 1:14-19

14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:

15 And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.

16 And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.

17 And God set them in the firmament of the heaven to give light upon the earth,

18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.

19 And the evening and the morning were the fourth day.

Answer 2

Genesis 1:14-19 says that God created the sun, moon and stars on the fourth day, and set these lights in the firmament just above the earth as signs for seasons, days and years. The light of day had already been created on day 1, but the sun was to rule the day and the moon to rule the night.

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Answer 3

Day by day, God created the universe and its contents (Genesis ch.1).God created the universe out of nothing (Exodus 20:11, Isaiah 40:28; Rashi commentary to Genesis 1:14; Maimonides' "Guide," 2:30).Note that the Torah, in describing the Creation, deliberately employs brevity and ellipsis, just as it does in many other topics. See the Talmud, Hagigah 11b.

• On day 1: God created the universe in general, light, and this Earth. This light was not the same as that of the sun. Rather, it was light that God created before the sun, and which emanated from a point in space without any physical source; like what we might term a "white hole."
  
• On day 2: God created the separation between the Earth and the upper atmosphere.
  
• On day 3: God separated the continents from the oceans, and created plants.
  
• On day 4: God created the sun, moon, and stars. See also "day 1," above.
  
• On day 5: God created birds and fish.
  
• On day 6: God created animals and people.
  
• On day 7: God ceased creating, thereby creating the concept of rest.
  

See also the Related Links.

Link: Is there evidence for Creation?

Link: Can you show that God exists?

Link: Seeing God's wisdom