Astronomical Applications Department, US Naval Observatory
The Astronomical Applications Department (AAD) of the U.S. Naval Observatory computes, from fundamental astronomical reference data, the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. This page describes the Earth's orbit, seasons and their relation to Milankovitch cycles. Users can also follow links to the AAD's publications, data services, software, FAQ and research.
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Part of the Starting Point collection. The Starting Point collection includes resources addressing the needs of faculty and graduate students designing, developing, and delivering entry-level undergraduate courses in geoscience.