Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node560.html
Дата изменения: Fri Feb 23 14:03:30 1996
Дата индексирования: Tue Oct 2 19:05:47 2012
Кодировка:

Поисковые слова: п п п п п п п п п п п п п п п п п
Equinox



next up previous contents
Next: Optional stellar data Up: Required stellar data Previous: Declination

Equinox

Because precession is a large effect, we must know the equinox to which these coordinates refer. Although this is usually a constant for a whole table, and so might be stored in a descriptor, observers may want to use lists of program stars compiled from heterogeneous sources. Therefore, the year of the equinox must be stored in a separate column of Real*4 values, with the label EQUINOX. This column is easily created for a star catalog with a single equinox date using the COMPUTE/TABLE tablename :EQUINOX = year command. A format of F7.2 is satisfactory.

  
Table: Columns for star-catalog table files



Pascal Ballester
Tue Mar 28 16:52:29 MET DST 1995