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**Flat Earth Theory / Is there a flat Earth Jean Meeus?**

« **on:**September 20, 2020, 09:44:16 AM »

Jean Meeus is a Belgian astronomer. He published a book called

His algorithms have been implemented in a variety of languages:

https://developer.aliyun.com/mirror/npm/package/meeusjs

https://www.npmjs.com/search?q=keywords:meeus

https://crates.io/crates/meealgi

https://pypi.org/project/PyMeeus/

http://libnova.sourceforge.net/

His formulas and algorithms use angular values: latitude and longitude for terrestrial location, declination and right ascension for positions of celestial bodies. They use values such as the eccentricity of the Earth's orbit or the obliquity of the ecliptic, that only make sense in a spherical Earth model. They are, most definitely, built on a round Earth model.

There is a live implementation here of the formulas for sunrise and sunset times: https://www.esrl.noaa.gov/gmd/grad/solcalc/index.html and details here https://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html , you can even download a spreadsheet to run it on your computer with Excel or OpenOffice.

Anyone can check that the calculations are pretty accurate. The sunrise and sunset calculations are just a small subset of Meeus' algorithms and formulas, but they are an obvious example because everyone will know what they mean and will be able to check their accuracy.

Is there a flat Earth equivalent, that works equally well, based on EA or anything else?

*Astronomical Formulae for Calculators*and another called*Astronomical Algorithms*. As their name suggest, they detail ways to implement formulas and algorithms to calculate position of celestial bodies and other astronomy-related calculations.His algorithms have been implemented in a variety of languages:

https://developer.aliyun.com/mirror/npm/package/meeusjs

https://www.npmjs.com/search?q=keywords:meeus

https://crates.io/crates/meealgi

https://pypi.org/project/PyMeeus/

http://libnova.sourceforge.net/

His formulas and algorithms use angular values: latitude and longitude for terrestrial location, declination and right ascension for positions of celestial bodies. They use values such as the eccentricity of the Earth's orbit or the obliquity of the ecliptic, that only make sense in a spherical Earth model. They are, most definitely, built on a round Earth model.

There is a live implementation here of the formulas for sunrise and sunset times: https://www.esrl.noaa.gov/gmd/grad/solcalc/index.html and details here https://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html , you can even download a spreadsheet to run it on your computer with Excel or OpenOffice.

Anyone can check that the calculations are pretty accurate. The sunrise and sunset calculations are just a small subset of Meeus' algorithms and formulas, but they are an obvious example because everyone will know what they mean and will be able to check their accuracy.

Is there a flat Earth equivalent, that works equally well, based on EA or anything else?