The Sun

NOAA Global Monitoring Laboratory (n.d.). NOAA Solar Calculator. NOAA Global Monitoring Laboratory. https://gml.noaa.gov/grad/solcalc/

@misc{cite:noaa-solar-calculator,
  title        = {NOAA Solar Calculator},
  organization = {NOAA Global Monitoring Laboratory},
  year         = {n.d.},
  url          = {https://gml.noaa.gov/grad/solcalc/},
  note         = {Public-domain solar-position algorithm — declination, equation of time, sunrise/sunset, and twilight — the method implemented by the computed Sun & Twilight times.}
}

NASA (n.d.). Sun — NASA Solar System Exploration. NASA. https://science.nasa.gov/

@misc{cite:nasa-star-sun,
  title        = {Sun — NASA Solar System Exploration},
  organization = {NASA},
  year         = {n.d.},
  url          = {https://science.nasa.gov/},
  note         = {NASA overview of Sun.}
}

NASA (n.d.). The Sun — NASA Science. NASA. https://science.nasa.gov/sun/

@misc{cite:nasa-sun,
  title        = {The Sun — NASA Science},
  organization = {NASA},
  year         = {n.d.},
  url          = {https://science.nasa.gov/sun/},
  note         = {NASA overview of the Sun: our star, its structure, and its role in day, night, and the seasons.}
}

United States Naval Observatory (n.d.). USNO Astronomical Applications Department. United States Naval Observatory. https://aa.usno.navy.mil/

@misc{cite:usno-astronomical-applications,
  title        = {USNO Astronomical Applications Department},
  organization = {United States Naval Observatory},
  year         = {n.d.},
  url          = {https://aa.usno.navy.mil/},
  note         = {Solar and lunar coordinates, phase, and rise/set/twilight/transit methodology (the Astronomical Almanac); the public-domain formulae behind the computed Moon phase, the computed Sun & twilight times, and the computed moonrise/moonset and lunar position.}
}