RE: [find_orb] Find_Orb - Before Christ MPCORB elements ?

Roger W. Sinnott Oct 17 7:50 AM

Alessandro,

 

I don’t know what conventions are used by various online databases, but in standard chronological practice,

   99 BC is the year -98 (not -99).

 

This is because there is no “0 BC”:

 

AD 3     year +3

AD 2     year +2

AD 1     year +1

1 BC     year 0

2 BC     year -1

3 BC     year -2

. . . etc.   

 

         Roger

 

 

From: find_orb@yahoogroups.com [mailto:find_orb@yahoogroups.com] On Behalf Of alessandro odasso
Sent: Tuesday, October 15, 2013 4:19 PM
To: find_orb find_orb
Subject: [find_orb] Find_Orb - Before Christ MPCORB elements ?

 

. . .

 

1st test

I press the ephemeris button, and I choose a date 99 years B.C.

So I write 99 with a menus sign:

 

-99-Jan-01

 

I choose MPCORB elements and that's fine. After very little, I get the result.