nakbrooks Posted May 8, 2013 Report Share Posted May 8, 2013 I will need to align my DDM85K pier to within a few degrees of North before I can install the mount and OTA to do a proper alignment. I need an easy way of finding North for the pier that is more accurate than a standard compass and was proposing to use the sun's shadow at local noon. Can anyone tell me the formula to calculate the precise time of day (UTC) at which the shadow cast by a vertical pole will point directly North, given the location (lat/long) of the pole? Thanks Nigel Link to comment Share on other sites More sharing options...
nakbrooks Posted May 8, 2013 Author Report Share Posted May 8, 2013 OK, I've answered my own question. This website gives the time of local noon for any geographic location: http://www.solar-noon.com/ Nigel Link to comment Share on other sites More sharing options...
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