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Home > Besselian epoch

A Besselian epoch, named after the German mathematician and astronomer Friedrich Bessel (1784 - 1846), is an epoch that is based on a Besselian year , which is a tropical year measured at the point where the Sun's longitude is exactly 280°.

Since 1984, Besselian epochs have been superseded by Julian epochs. The current standard epoch is J2000.0, which is a Julian epoch.

Besselian epochs are calculated according to:

B = 1900.0 + ( Julian date - 2415020.31352)/365.242198781

The standard epoch that was in use before the current standard epoch ( J2000.0) was B1950.0, a Besselian epoch.

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Besselian epochA Besselian epoch named after the German mathematician and astronomer Friedrich Bessel (1784 1846), is an epoch that is based on a Besselian year, which is a tropical year measured at the point where the Sun's longitude is exactly 280°. Since 1984, Bessel  
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