In astronomy, a year is defined as the time it takes a planet to make one full orbit around the sun. It is equivalent to the orbital period of a planet, and is typically expressed in terms of Julian Year (which is equal to one Earth year).
The Italian who first used a telescope to study astronomy was Galileo Galilei, born in 1564, the same year as William Shakespeare. Galileo is renowned for his significant contributions to observational astronomy, including the discovery of the moons of Jupiter and the phases of Venus. His work laid the foundation for modern physics and astronomy, challenging the geocentric model of the universe.
astronomy, astrophysics
Anything outside the Earth is astronomy.
In astronomy, a day is the time it takes for a planet to rotate once on its axis. A month is the time it takes for the moon to orbit around a planet. A year is the time it takes for a planet to orbit around its star.
1972.(Astronomy, Cornell University, USA.)
a year
In astronomy zenith (the point in the sky exactly above you) is the point most distant from the horizon. As a horizon defines how far down the sky you can look, zenith defines how high up you can look.
1620
"Prehistoric" means "before written history", so if there was any astronomy at that time, we won't know the exact year.
2009 is the International Year of Astronomy, the International Year of Natural Fibres, and the International Year of Reconciliation.
In the year AD 813 (also called the year 813 CE).
18,000-23,000 a year
federal budget
Light years measure distance in astronomy. It is the distance that light travels in one year, which is about 9.46 trillion kilometers.
they complete their lifecycle in a year or less
The aim of the Year is to stimulate worldwide interest, especially among young people, in astronomy and science under the central theme "The Universe, Yours to Discover". IYA2009 events and activities will promote a greater appreciation of the inspirational aspects of astronomy that embody an invaluable shared resource for all nations
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