Of course the 18th SDS keeps track of the orbit numbers. And they publish these
numbers in all their orbital parameters, like TLEs. That's why satellite tracking
programs can show you the orbit number.

Note that there are several different definitions for the orbit number. Depending
on the definition used by the source of your orbital parameters,  the number may
have an offset of 1. Therefore most people don't use orbit numbers. They simply
use the date/time as reference.

73,
Nico PA0DLO

On 06-01-2025 06:12, John Lutz via AMSAT-BB wrote:
Thank you to everyone for working through this for me.  It's interesting that the ISS has made so many revolutions around the earth.  I was unaware of that.

Regarding orbit numbers, I suppose that I thought that the U.S. Space Command (or some other government agency) perpetually kept track of that kind of thing.

Thank again.

John, N9JL

On Monday, January 6, 2025 at 01:02:13 AM UTC, christy via AMSAT-BB <[email protected]> wrote:


per the question below:

using SatPC32/winlisten, using daily-bulletin.txt keps it was 48987

73 Christy KB6LTY

--------------------

Do any of you happen to know the orbit number for the ~05:00 UTC ISS
pass over North America on 5 January (late last night local time)? My
son had the best image capture he's ever gotten (the one with the
Japanese children in a classroom). I would like to have the orbit number
for his archives.


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