1. When using Besselian years, specify which definition is being used. 2. Before 1984 Besselian equinoxes and epochs were used. 3. Lieske says that a " Besselian epoch " can be calculated from the Julian date according to 4. A Besselian year is named after the German mathematician and astronomer Friedrich Bessel ( 1784 1846 ). 5. Besselian years, used mostly for star positions, can be encountered in older catalogs but are now becoming obsolete.6. Since 1984, Besselian equinoxes and epochs have been superseded by J2000.0, which is a Julian epoch. 7. Historically used Besselian equinoxes include B1875.0, B1900.0, B1925.0 and B1950.0. 8. In 1824, Bessel developed a new method for calculation the circumstances of eclipses using the so-called Besselian elements. 9. To distinguish between calendar years and Besselian years, it became customary to add " . 0 " to the Besselian years. 10. To distinguish between calendar years and Besselian years, it became customary to add " . 0 " to the Besselian years.
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