# Re: ao40 squint

• Subject: Re: [amsat-bb] ao40 squint
• From: "Michael Williams" <k9qho@xxxxxxxxxxxxxxxx>
• Date: Mon, 16 Jun 2003 21:22:31 -0400

```James:

The formula is:

A=ALON+180

But if A>360, then A=A-360

ALAT will be same but with a changed sign.

So if ALON/ALAT is 45/2, then A=ALON+180=225  and ALAT is -2.

If ALON/ALAT is 344/1, then A=ALAT+180=524
A=A-360=164. ALAT is -1.

Good Luck
Mike

----- Original Message -----
From: "James Cizek" <jcizek@yuma.acns.ColoState.EDU>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, June 16, 2003 4:39 PM
Subject: [amsat-bb] ao40 squint

>   Hi all,
>
>   A quick question.  I am playing with WinOrbit right now
>   (usually use sattrack under linux) as a windows based
>   tracker that will run my Prarie digital board I use to
>   aim everything.  The program tracks the sats fine but the
>   squint calcs seem way off.  For todays ao40 pass I am using
>   ALAT of 1 and ALON of 344 in my AO40.ATT file (contents shown below)
>   and am getting a squint of 161 degrees at MA 30 increasing to 175
degrees
>   midway and reducing to 166 degrees at MA 130.
>   Am I missing something simple here?  The time is set right and accurate
>   (box is on NTP) and the qth is correct (to as good as GPS can do) also.
>   I read that the squint was supposed to be closer to 30 degrees and under
>   during this MA period (passbands on).  Is the program right or did I
>
>   Contents of my ao40.att file in the winorb36/database/sat directory:
>
> ; Remove the ";" from the following line if you have updated information
> [Attitude]
> Alon=344
> Alat=1
> Expiration=30503.1000000
>
>
>   Am I missing a minus sign on one of the numbers? Is the (way into the
>   future) expiration too far out?
>   Thanks for any suggestions!!
>
>   -James  KI0KN
>
> ----
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>

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