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Ephemeris Computation Office

Contents

ECO, NAOJ
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Reki Yoko
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Calendar and Ephemeris
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FAQ
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for PCs

Daily Calendar
Simple calendar which shows rising, transit, setting of the Sun and the Moon for major cities
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Monthly Calendar
24 Sekki, Phases of the Moon such as new moon, full moon
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Yearly Calendar
Calendars
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Sky Viewer
Starry sky viewer for major cities
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Sky Viewer (powered by Google Maps)
Starry sky viewer for any place
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Koyomi Station
You can easily obtain lots of information, such as 1) Times of rising, setting, transit of the Sun, the Moon, and planets, 2) Altitude and Azimuth of the Sun, the Moon, and planets, 3) Lunar Age.
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Solar Eclipse
General circumstances and local prediction of Solar Eclipse
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Lunar Eclipse
General circumstances and local prediction of Lunar Eclipse
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Transit of planet
General circumstances and local prediction of transit of Mercury / Venus
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Lunar occultation of planet
General circumstances and local prediction of lunar occultation of planet
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for Mobile Phones

Koyomi Mobile
Web site for mobile phones
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Daily Calendar for mobile phones
Simple calendar which shows rising, transit, setting of the Sun and the Moon for major cities
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Monthly Calendar for mobile phones
Date and time 24 Sekki and Lunar Phases
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Sky Viewer for mobile phones
You can check what star is visible today.
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Solar Eclipse (Geolocation)
Local Prediction of Solar Eclipse
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Lunar Eclipse (Geolocation)
Local Prediction of Lunar Eclipse
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Transit of Planet (Geolocation)
Local Prediction of Transit of Planet
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Lunar Occultation (Geolocation)
Local Prediction of Lunar Occultation
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