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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Angle setting on HH motor
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<blockquote data-quote="futumsch" data-source="post: 651784" data-attributes="member: 321089"><p>Well, I like a challenge and with half an A4 notepad full of spherical trigonometry trying to work it out directly, I gave up. I could never work out inverse cosines anyway.</p><p></p><p>Then I opened my 'Practical Astronomy with your Calculator' by Peter Duffett-Smith. In there, is a chapter on horizon to equatorial coordinate conversion.</p><p></p><p>First find declination;</p><p></p><p>d = Arcsin ((sin a * sin L) +(cos a * cos L * cos A))</p><p></p><p>Then find Hour Angle (Polar angle),</p><p></p><p>H = ArcCos ((sin a - sin L * sin d) / (cos L * cos d))</p><p></p><p>Where</p><p>a=satellite elevation</p><p>A=satellite Azimuth</p><p>L=Observer Latitude</p><p></p><p>Then find Sine of the Azimuth. If sin A is postive, then the answer is 180-H. I can get the sums to work fine if the satellite is East of the observer, but if it is west, then you have to use 180-H.</p><p></p><p>Excuse my for a while while i detox from all that trigonometry...</p></blockquote><p></p>
[QUOTE="futumsch, post: 651784, member: 321089"] Well, I like a challenge and with half an A4 notepad full of spherical trigonometry trying to work it out directly, I gave up. I could never work out inverse cosines anyway. Then I opened my 'Practical Astronomy with your Calculator' by Peter Duffett-Smith. In there, is a chapter on horizon to equatorial coordinate conversion. First find declination; d = Arcsin ((sin a * sin L) +(cos a * cos L * cos A)) Then find Hour Angle (Polar angle), H = ArcCos ((sin a - sin L * sin d) / (cos L * cos d)) Where a=satellite elevation A=satellite Azimuth L=Observer Latitude Then find Sine of the Azimuth. If sin A is postive, then the answer is 180-H. I can get the sums to work fine if the satellite is East of the observer, but if it is west, then you have to use 180-H. Excuse my for a while while i detox from all that trigonometry... [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Angle setting on HH motor
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