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Closest Approach of Mars 2018

  • The date of closest approach of Mars will be July 31st. This will be the closest approach since 2003.
  • Mars is already shining brighter than Jupiter these days. Watch out for larger and brighter red planet Mars this summer.
  • Please set time appropriately when using Sky Viewer.
  • Around 20:00, you can also enjoy Venus, Jupiter and Saturn at the same time.

Getting information on Calendars

Calendars
Daily Calendar : Times of rising, transit, setting of Sun and Moon for major cities in Japan.
Monthly Calendar : Dates of 24 Solar Terms and phases of the Moon.
Yearly Calendar : Simple Calendar
Local Calendar : Times of rising, setting, transit of Sun and Moon for major cities in Japan
Sky Viewer / Frame Version
Starry sky viewer for major cities. Google Maps version is also available.
Koyomi Station
You can easily obtain astronomical data such as
 Times of rising, setting, transit of the Sun, the Moon, and planets;
 Altitude and Azimuth of the Sun, the Moon, and planets;
 Lunar Age.
Solar Eclipse
General circumstances and local prediction of Solar Eclipse
Lunar Eclipse
General circumstances and local prediction of Lunar Eclipse
Transit of Planet
General circumstances and local prediction of Transit of Mercury / Venus
Lunar Occultation of Planet
Local prediction of Lunar Occultation of Planet

Products

Reki Yoko
Calendar and Ephemeris
"Calendar and Ephemeris" Web Version

Other Resources (Japanese Only)

Topics / Reki Wiki
Rika Nenpyo, The Chronological Scientific Tables [external link]
Rare Materials Exhibition