Exactly 365. 25 days, in which a century (100 years) is exactly 36525 days and in which 1900. 0 corresponds exactly to 1900 January 0. 5 (from the Julian-date system, which is half a day different ...
The units used to describe brightness of astronomical objects. The smaller the numerical value, the brighter the object. The human eye can detect stars to 6th or 7th magnitude on a dark, clear night ...
Small rocky and/or icy particles that are swept up by the earth in its orbit about the sun. Also called "shooting stars", they travel across the sky in a very short time, from less than a second to ...
Parameters (numbers) that determine an object's location and motion in its orbit about another object. In the case of solar-system objects such as comets and planets, one must ultimately account for ...
1 词条
