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Astronomy (161)
ASTR 1P01 (93)
Lecture

Solstices

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Department
Astronomy
Course
ASTR 1P01
Professor
Bozidar Mitrovic
Semester
Fall

Description
Astronomy lecturethSeptember 30 2011stThe first day of summer Around June 21The first day of winter Around Dec22At our latitude July as hotter than June and January is cooler than December WhyThermal invertiait takes some time for the water masses to warm up or cool down 70 of the earths surface is covered with water The Earths rotational axis precesses wobbles once every 26000 years As a result of this pressesion the north celestial pole moves relative to the stars This was detected first by Hipparcus between 146 bc and 130 bcThe calendar is adjusted over time so that the vernal equinox is always around March
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