Earth Geometry

Image
By NASA/Apollo 17 crew; taken by either Harrison Schmitt or Ron Evans [Public domain], via Wikimedia Commons Speed of light 300,000,000 meters per second Circurference of the Earth is 40,000,000 meters Half way around the earth is 20,000 meters Time to transmit to the most distant place on earth is 20,000 / 300,000,000 is 0.067 milli seconds A geostationary orbit, often referred to as a geosynchronous equatorial orbit[1] (GEO), is a circular geosynchronous orbit 35,786 km (22,236 mi) above Earth's equator and following the direction of Earth's rotation. 35,786,000 meters up and down 35,786,000 x 2 / 300,000,000 is 0.239 seconds This delay presents problems for latency-sensitive applications such as voice communication. https://en.wikipedia.org/wiki/Geostationary_orbit

Communications

https://upload.wikimedia.org/wikipedia/commons/b/b4/Comparison_satellite_navigation_orbits.svg
By Cmglee, Geo Swan [CC BY-SA 3.0 or GFDL], from Wikimedia Commons

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20182018 - pre published v0.9