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[i]The beta angle is the angle between the orbital plane and a line drawn from the Sun to the Earth. As the beta angle increases, the ISS is exposed to more sunlight per orbit, and eventually it will be in constant sunlight — in other words, there is no passing into the Earth's shadow for extended periods of time. This can create thermal problems, so special attitudes are chosen to counter these effects. The [visiting vehicle] also has thermal constraints under these conditions. Since the attitude requirements of the ISS and [vehicle] would conflict when docked, [visting vehicle]/ISS flights are scheduled to avoid periods when the beta angle exceeds 60 degrees.[/i]
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