γ is the central angle measured between rE and rSīuilt using a Raspberry Pi 3b and the Android Things embedded OS platform, ISSOT utilizes tracking information and motors to point at the space station.d is the vector from the tracker to the ISS.rE is the vector from the center of the earth to the earth station (the tracker).rS is the vector from the center of the earth to the ISS.The figure below shows the addtional vectors and angles needed to calculate the elevation angle. A vertically upwards is +90° and vertically downwards is –90°. This angle has a value between –90° and +90° such that the horizontal direction is 0°. Ψ = atan2((sin Δλ ⋅ cos φ₂), (cos φ₁ ⋅ sin φ₂ − sin φ₁ ⋅ cos φ₂ ⋅ cos Δλ))Įlevation (El) is the angle measured in the plane perpendicular to the horizon going up towards to the ISS. This angle has a value between 0° and 360°. Its location in the sky can be determined by using two “look angles” called, Azimuth & Elevation.Īzimuth (ψ) is the angle measured in the plane parallel to the horizon from the polar north going clockwise. Each orbit takes 90-93 minutes, depending on the exact altitude of the ISS. It travels from west to east on an orbital inclination of 51.6 degrees. The ISS conducts operations in the low earth orbit (LEO) about 400 km above the earth’s surface. This relatively simple device will give you a visual indication of the location of the Space Station, even if you can’t see it. ![]() It calculates and displays the azimuth and elevation during the ISS orbits. The ISS Orbit Tracker (ISSOT) is an Android Things experiment that keeps track of the International Space Station.
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