Hi.
Excuse me for my defective English.
One more time I write for ask you something about keplerian elements: ¿The epoch time calculated in Keplerian Elements is a Julian date or is a Gregorian date?. I think than is a Greogorian date, but I am not sure.
Thanks for your information.
Heiler Yesid Ledezma Leudo. Investigador: Proyecto Espacial Colombiane Órbita
Heiler Yesid Ledezma Leudo. Estudiante de Tecnología Electrónica -U. Distrital.
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HEYLER YESID LEDEZMA LEUDO wrote:
Hi.
Excuse me for my defective English.
No trouble at all ...
Keplerian Elements is a Julian date or is a Gregorian date?.
Gregorian.
The following is from http://celestrak.com/columns/v04n03/#FAQ02
(H)ow is the epoch time format interpreted? This question is best answered by using an example. An epoch of 98001.00000000 corresponds to 0000 UT on 1998 January 01—in other words, midnight between 1997 December 31 and 1998 January 01. An epoch of 98000.00000000 would actually correspond to the beginning of 1997 December 31—strange as that might seem. Note that the epoch day starts at UT midnight (not noon) and that all times are measured mean solar rather than sidereal time units (the answer to our third question).
-Joe KM1P
At 01:56 PM 5/22/2007, HEYLER YESID LEDEZMA LEUDO wrote:
¿The epoch time calculated in Keplerian Elements is a Julian date or is a Gregorian date?. I think than is a Greogorian date, but I am not sure.
I understand your confusion. The date is specified using the Gregorian calendar. The Julian calendar is obsolete.
Dates used in astronomical calculations are often referred to as "Julian Dates", but this does not refer to the Julian calendar. Instead, this simply means a number that indicates the number of days since some agreed-upon time.
participants (3)
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Franklin Antonio -
HEYLER YESID LEDEZMA LEUDO -
Joe Fitzgerald