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InterplanetaryCalendars.com               Interplanetary Calendars

Will Napoli invented his first interplanetary calendar in mid-July of 1985. It wasn't until 12 years later when he had completed calendars for all the planets of the solar system that he discovered his original interplanetary calendar for Mars was the first complete calendar for any planet other than Earth and in the years since, it's proven to be the best. It's the only one that is part of a system that allows calendars for any world to be integrated into a collective that shares the same universal time units, the ones we use today. There's much more to it than that though.

The Interplanetary Calendars

Mesoplanna

The Mercuriannum (for Mercury)

The Venusiannum (for Venus)

The Terrannum (for the Earth system)

The Areannum (for the Mars system)

Microplanna

Ateneanna

The Apophidiannum (for the asteroid Apophis)

The Sekhmetiannum (for the asteroid Sekhmet)

The Amuneannum (for the asteroid Amun)

The Rashalomeannum (for the asteroid Ra-Shalom)

Apollonianna

The Apolloniannum (for the asteroid Apollo)

Amoreanna

The Erotiannum (for the asteroid Eros)

Centaurianna

The Chironeannum (for the centaur Chiron)

Macroplanna

The Joviannum (for the Jovian system)

The Saturniannum (for the Saturn system)

The Uranusiannum (for the Uranus system)

The Neptuniannum (for the Neptune system)

Miniplanna

The Vestiannum (for the proto-panet Vesta)

The Cereriannum (for the dwarf planet Ceres)

The Plutannum (for the dwarf planet Pluto system)

The Haumeannum (for the dwarf planet Haumea system)

The Makemakeannum (for the dwarf planet Makemake)

The Erodiannum (for the dwarf planet Eros system)

Comanna

The Halleannum (for the comet 1P/Halley)

Exoplanna

The 51bPegasudiannum (for the exoplanet 51-Pegasus-b)

The 61Virginiannum (for the exoplanetary system of 61-Virginius)

The Icarianna (for the exoplanet HD 80606 b)

(Many more coming soon.)

Need a Date?

Check Earthman's Almanac (visit) for today's date on all the planets and other worlds of the solar system and beyond!


What's New?

The Terrannum 16

The Areannum 8.2

The Cereriannum 4.1 - 4.5 (that's five calendar installments)

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