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*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 > > ---- > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org ---- Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**References**:**Definition of Orbit start - ascending node?***From:*Helmut Strickner

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