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- Julian callender created in 46 BC
- a regular year of 365 days divided into 12 months with a leap day added to febuary every four months
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200BC--1300AD
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-Chinease astronomer around 300 BC
-first known by name to compile a star catolauge
-made some of the first detailed observations of Jupiter
-reported a "small redish star" next to jupiter which is believed to be its moon Ganymede
-divided celestrial sphere into 365.25 degrees, because this was the ammount of days in a tropical year -
Greek astronomer Callippus determines the liength of the seasons (starting at the spring equinox) to be 94 days, 92 days, 89 days, and 90 days
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- Chinese astronomer Gan De reported a "small reddish star" next to Jupiter -believed to be Ganymede
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First Babylonian star catalogues dating from about 1200 BC, earlyest we know of
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the tablet of Ammi-saduqa, which lists the first and last visible risings of Venus over a period of about 21 years and is the earliest evidence that the phenomena of a planet are recognized as periodic
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-Babylonian tablets document the application of mathematics to the variation in the length of daylight over a solar year
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- 190-120 BC -Created Triginometry -created very acurate star catolauge
- tried to develop heliocentricmodel,but he abandoned his work because the calculations showed the orbits were not perfectly circular as believed to be by the science of the time.
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Earlyest solar eclipse recorded by China in one of the five classics of chinese history
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- the first phase of stonehenge begins, it is believed to be used as a solar/lunar observatory
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- a sexagesimal is a base 60 place-value number system
- simplified the task of recording very large and very small numbers -developed around 3000 BC
- a sexagesimal is a base 60 place-value number system
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the 365 day period of the Egyptian calendar in use
-observation of stars was important in determining the annual flooding of the Nile
