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| It is what consists of all space and the matter space contains. |
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| The study of all physical objects beyond Earth. |
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| The time required for the Earth to revolve once around the Sun. |
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| Roughly the amount of time required for the moon to revolve once around the Earth. |
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| The time required for the Earth to rotate once on its axis. |
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| A year in which an extra day is added to the calendar |
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| What is the Julian Calendar? |
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| Based on a 365.25 day. Creater, Julius Caesar, added 90 days to year 46 BCE and an extra day every four years. |
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| What is the Gregorian Calendar? |
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| mid-1500s, actually 365.242 days in a year, creator Pope Gergory XIII dropped 10 days from year 1582 and restricted leap years to years that are divisible by 4, but not 100. |
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| Calendar most countries use |
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| Greek astronomer, created Ptolemaic theory |
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| What is the Ptolemaic theory? |
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| theory that stated that the Earth was at the center of the universe and the sun and other planets revolve around it. |
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| Polish astronomer, developed theory |
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| What was Copernicus's theory? |
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| The sun is at the center of the universe and the planets revolve around the sun. |
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| late 1500s astronomer, used large tools such as quadrant, recorded exact measurements on positions of sun, moon, and planets |
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| took over Tycho's research when he died, announced new laws of plannetary motion, states that all planets revolve around the sun in an ellipse |
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| 1609, first person to observe objects in space with a telescope, discovered four moons orbiting Jupiter, craters and mountains on the moon, and sunspots. |
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| explained why planets revovle around the sun and why moons revolve around planets (gravity) |
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| 1920s, determined Milky Way was a distant galaxy, this meant the universe is much larger than just our galaxy |
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