Besselian year Comparison Table

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Besselian year comparison table

Subject is an instance of is a kind of has definition

year time unit A period of time based on the revolution of the Earth around the Sun.

Besselian year year The period of one complete revolution in right ascension of the fictitious mean sun, as defined by Newcomb. The beginning of a Besselian year, traditionally used as as standard epoch, is denoted by the suffix ".0". Since 1984 standard epochs have been defined by the Julian year rather that the Besselian year. For distinction, the beginning of the Besselian year is now identified by the prefix B (e.g., B1950.0).

Subject	is an instance of	is a kind of	has definition
year		time unit	A period of time based on the revolution of the Earth around the Sun.
Besselian year	year		The period of one complete revolution in right ascension of the fictitious mean sun, as defined by Newcomb. The beginning of a Besselian year, traditionally used as as standard epoch, is denoted by the suffix ".0". Since 1984 standard epochs have been defined by the Julian year rather that the Besselian year. For distinction, the beginning of the Besselian year is now identified by the prefix B (e.g., B1950.0).

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