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Message: <blockquote data-quote="Peter7100" data-source="post: 767423" data-attributes="member: 48633">That would be a great addition to have to the forum <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool    :cool:" loading="lazy" data-shortname=":cool:" />, particulary as @Dawgpics reply has got me thinking about something and I can't find a way to calculate the following:If you take any point in the World, lets say San Francisco and you were able to extend say a ruler straight above you, how high would it have to go before someone, lets say in New York to was able to view it (assuming they could see that far). Obviously the curvature of the Earth x the distance between the two points will determine the answer. Anyone know if there is such a calculation as I assume one must exist somewhere <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused    :confused:" loading="lazy" data-shortname=":confused:" />I'm sure the following is probably involved in part of the calculation, where the average 6ft person can see approximately 3 miles to the end of the horizon and if you are say 1 mile up a mountain you could then see out to approximately 350 miles out to the horizon line.This is [USER=13196]@hark[/USER] 's fault as she got me thinking when she mentioned fires out west affecting colours<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue    :p" loading="lazy" data-shortname=":p" />layful:</blockquote>

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