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`local_sunrise.py` renders the sky for a given time and place on earth.
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i.e. plugging the values for n and N given in [1, Sec. 3.3] into eqs. (1) resp. (3) given by [2].
[1]: Hillaire. “Physically Based Sky, Atmosphere and Cloud Rendering in Frostbite”
[2]: Nishita et. al. “Display of the Earth Taking into Account Atmospheric Scattering”
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Supported by Intel OpenCL but not by Nvidia
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See "Display of the earth taking into account atmospheric scattering" (Nishita et al., 1993)
`bluedot.py` renders the full earth disk while rotating the sun around it.
`sunrise.py` renders the rise of the sun.
Physical model constants may be changed in `planets.py`.
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