Re: (meteorobs) algorithm for Solar Coordinates (including sun's true longitude)

• To: Meteor Observing Mailing List <meteorobs@latrade.com>
• Subject: Re: (meteorobs) algorithm for Solar Coordinates (including sun's true longitude)
• From: Lew Gramer <dedalus>
• Date: Mon, 14 Sep 98 11:27:32 -0400
• In-Reply-To: Your message of "Sat, 12 Sep 98 16:17:54 PDT." <l03130300b2203638d2cf@[206.63.41.242]>
• Reply-To: meteorobs@latrade.com
• Sender: owner-meteorobs

Just so I understand, the original question was: "At what UT time & date in a 
given year can the Earth be found at a given solar longitude, i.e., a 
particular fixed point relative to the stars in its annual orbit?"

And the flip question, of course: "What is Earth's solar longitude at a 
particular UT time/date in a particular year?"

Now how do you convert from the Sun's RA/Dec position at a given time, to our 
solar longitude? Or is the point of Jerry&Judy's post that we first calculate 
the Sun's ecliptical longitude *in our sky*, and then we - what? - subtract 180 
degrees to get Earth's ecliptical longitude as seen from the Sun?? Sorry about 
the dumb "coordinates" question here! :)

Lew

• Re: (meteorobs) algorithm for Solar Coordinates (including sun's true longitude)
• From: "Jennifer (& Gregg) Lobdell" <jenlobdell@halcyon.com>

• Re: (meteorobs) algorithm for Solar Coordinates (including sun's true longitude)
• From: "Jennifer (& Gregg) Lobdell" <jenlobdell@halcyon.com>

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