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According to Wikipedia, the origin of the system is: The zero point (SGB=0°, SGL=0°) lies at (l=137.37°, b=0°). In J2000 equatorial coordinates, this is approximately (2.82 h, +59.5°). In the same article there is a recent referred paper on this topic, which explains [The zero point] is one of the two regions where the SGP is crossed by the Galactic plane. ...

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In addition to the requirements that it be night, and the ISS be overhead, the space station must also not be eclipsed by the earth's shadow. With earth taking up roughly 88 degrees of sky from the ISS's typical altitude of 420 km, eclipses correspond to night-time on the space station. They're each 45 minutes long, and happen 16 times a day. Harmonics ...

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No special techniques are required that I am aware of, but several observations must be taken to make a reasonable estimate of the orbit. Once a sufficient number of observations are made so that the orbital elements can be determined, then anything that has an elliptical orbit (eccentricity >0 but >1) can be assumed to be orbiting as part of the solar ...

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