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# R: Definition of Orbit start - ascending node?

• Subject: R: [amsat-bb] Definition of Orbit start - ascending node?
• From: "elio sequino" <elioseq@xxxxxxxxx>
• Date: Thu, 17 May 2001 15:03:41 +0200

```Hi all

The angle from a perigee to another in a stable orbit is of 360 degrees but
often the orbit is not very stable and a phenomen that we in Italy call
"precessione degli apsidi " have the capability to shorter or longer the the
distance between two perigee. So the effective angle of an orbit may be less
or more  360 degrees.  The distance in degrees of an orbit  refered from a
node to another node is exactly 360 degrees.

73 from Elio Sequino Ik8ppy

----- Original Message -----
From: Helmut Strickner <hstr@gil.com.au>
To: <amsat-bb@AMSAT.Org>
Sent: Thursday, May 17, 2001 9:08 AM
Subject: [amsat-bb] Definition of Orbit start - ascending node?

> Hi,
>
> Can anyone clarify the definition of the start of a satellite revolution
> please?
>
> In NORAD's convention, a revolution begins when the satellite is at the
> ascending node of its orbit and a revolution is the period between
> successive ascending nodes. The period from launch to the first ascending
> node is considered to be Rev 0 and Rev 1 begins when the first ascending
> node is reached.
>
> I believe that the Amsat definition of the beginning of a new revolution
is
> at perigee.
>
> Clarification in this matter would be welcome.
>
> 73!
> Helmut, VK4STR
>
> ----
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```

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