 Sun Altitude (Daily Variation) | This tool calculates and graphs the changes in the Sun's altitude and azimuth throughout the day. |
| Sun's Altitude (Daily Variation—Sky Chart) | This tool calculates the daily changes in the Sun's altitude and azimuth and displays them on a sky chart. |
| Sun's Altitude (Annual Variation at the Same Time of Day) | This tool calculates the sun's altitude and azimuth for each week over the course of a year and displays the results in a graph. |
| Solar Meridian and Equation of Time | Calculates the time of solar noon and the equation of time, and displays a graph of their annual variation. |
| Sunrise and Sunset Calculator | Calculate the times, azimuths, and altitudes of sunrise, solar noon, and sunset at the observation point. |
| Sunrise and Sunset (Select a Japanese Place Name) | Create a table showing sunrise, noon, and sunset times for locations across Japan. Longitude, latitude, and altitude are set automatically. |
| Sunrise and Sunset Spots | Create a table showing sunrise, noon, and sunset times for a location famous for its sunrises and sunsets. This can be useful for photography and other activities. |
| Sunrise and Sunset (Selected Place Names from Around the World) | Create a table showing sunrise, noon, and sunset times around the world. |
| Calculating the Moon's Position | This tool calculates the position of the moon on a specified date at various observation points in Japan and displays the altitude on a graph. |
| Calculating the Moon's Position (Sky Chart) | This tool calculates the position of the Moon on a specified date at various observation points in Japan and displays it on a sky chart. |
| Moonrise and Moonset Calculator | Calculate the times, azimuths, and altitudes of the moonrise, meridian transit, and moonset at the observation point, as well as the lunar phase at noon. |
| Moonrise and Moonset (Select a Location in Japan) | This tool creates tables showing moonrise, meridian transit, moonset, and the lunar age at noon for locations throughout Japan. Longitude, latitude, and altitude are set automatically. |
| Moonrise and Moonset (Select a Location) | Create a table showing moonrise, moonset, and the moon's meridian passage times, as well as the lunar age at noon, for locations around the world. |
| Calculating the positions of planets | Calculate the azimuth, elevation, and distance from Earth for the planet. |
| Calculating the positions of planets in the ecliptic and equatorial coordinate systems | Calculate the right ascension, declination, apparent right ascension, apparent declination, and distance of a planet from Earth. |
| Planetary Rise and Set Calculations | Calculate the times and azimuths of the planet's rise and set, as well as the times and altitudes of its meridian transit, relative to Earth. |
| Planet Rise and Set Calculations (Select a Location in Japan) | This tool calculates the rise and set times, azimuths, meridian transit times, and altitudes of the planets in various locations across Japan. Longitude, latitude, and altitude are set automatically. |
| Planet Rise and Set Calculations (Select a Location) | Calculate the rise and set times, azimuths, meridian transit times, and altitudes of planets around the world. |
| Escape velocity | We will calculate the escape velocity from the planet and the escape velocity from the solar system. |
| Satellite orbit | Calculate the speed and orbital period of an artificial satellite in a circular orbit around the Earth. |
| Converting from the Julian calendar to the Gregorian calendar | Calculates the dates in the Julian and Gregorian calendars based on a Modified Julian Date or a Julian Date. |
| Julius Day calculation | Calculates the modified Julian day and the Julian day based on the Julian or Gregorian calendar. |
Astronomy