Date: 24 Aug 2006 16:01:23
From: canopus56
Subject: Ann: Sunspot and planetary feature lat long javascript calculator
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http://members.csolutions.net/fisherka/astronote/astromath/spfp/SolPnLatCalc.html
This is to announce an experimental online calculator to estimate the
solar or planetcentric geographic longitude and latitude of features
like sunspots or craters.
It is intended to be used by amateurs with solar sketches or
astrophotos how want to estimate the latitude and longitude of
uncertain features for later lookup in a gazetter. At best, the
calculator has a low precision of around 0-10 degrees.
Amateur literature on the Carrington's method for determining the
position of sunspots is listed.
Known alternatives are primarily mechnical disks for the sunspots,
available through the Stanford Solar Center -
http://solar-center.stanford.edu/solar-images/latlong.html
and overlays prepared using the USNO "Apparent Disk of Solar System
Object" online generator. The USNO generator creates a synthetic image
of a planet with a lat and long grid overlain on the image.
http://aa.usno.navy.mil/data/docs/diskmap.html
Again, this is an alpha experimental version. Donot expect too much
out of it. Maybe my first effort will inspire a programmer with more
skill to give it a go with a better version.
- Canopus56
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