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The equinox occurs at 5:24 p.m. EDT Monday, March 20, the latest start to astronomical spring since 2019. This differs from meteorological spring, which beings on March 1 every year.
Timeline of astronomical maps, catalogs and surveys. c. 1800 BC — Babylonian star catalog (see Babylonian star catalogues) c. 1370 BC; Observations for the Babylonia MUL.APIN (an astro catalog). [1] c. 350 BC — Shi Shen's star catalog has almost 800 entries; c. 300 BC — star catalog of Timocharis of Alexandria
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.
The first major Arabic work of astronomy is the Zij al-Sindh by Muhammad ibn Musa al-Khwarizmi. The work contains tables for the movements of the Sun, the Moon, and the five planets known at the time. The work is significant as it introduced Ptolemaic concepts into Islamic sciences. This work also marks the turning point in Arabic astronomy.
Astronomers posed over the past decade that dark comets, or objects that resemble asteroids but move like comets, may exist. Now, scientists have found a total of 14 of them.
Weekend stargazers will get their fill in February as three of the four weekends throughout the month will feature an astronomical event, all of which revolve around the moon.
For millennia, what today is known to be the Solar System was regarded as the contents of the "whole universe", so advances in the knowledge of both mostly paralleled. Clear distinction was not made until circa mid-17th century. See Timeline of Solar System astronomy for further details on this side.
What today is known to be the Solar System was regarded for generations as the contents of the "whole universe". The most relevant phenomena of these kind are: Basic gravity. Following the trajectory of free falling objects, the Earth is "below" us and the sky is "above" us.
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