Apphemeride Precise Astronomy

Apphemeride is a professional astronomy almanac for precise sky analysis, eclipses, Moon motion, planets, coordinates and horizon events.

Work with location-based calculations instead of generic tables. Apphemeride combines precise ephemeris data with visual tools for the Sun, Moon, planets, twilight, rise and set times, transits, azimuth, declination, ecliptic coordinates and local horizon geometry.

Use the Horizon Tracker to study how the Sun, Moon or planets move across your local horizon. Compare azimuth and altitude over a day, a month or a full year. Check daylight, twilight and darkness patterns by latitude, and estimate when a celestial body is visible within a chosen direction such as a window, balcony, observing site or side of a building.

Explore the solar system with relative planet positions, planetary orientation, illumination, phase angle, magnitude, angular size and distance data. Inspect Jupiter's Galilean moons and Saturn's moon system. Simulate the visible Moon with orientation, illumination and apparent motion, and study solar and lunar eclipses with maps and visual simulations.

Apphemeride helps answer exact questions: when the Sun, Moon or planets rise, transit and set; where an eclipse is visible and how it appears from a selected place; how coordinates, azimuth, altitude, twilight and horizon events compare between locations; when the next northern or southern declination extremes occur; and how quickly distances, positions or other values change over time.

Configure the data you want to see. Many values can be shown in multiple units and formats at the same time, with adjustable precision, separators and time bases. Compare distances, rates, angles, coordinates, visibility windows, event timing and elapsed time between events without reducing the sky to one simplified number.

This is a premium astronomy tool for serious skywatchers, eclipse chasers, educators, travellers, navigation practice and anyone who wants to understand celestial mechanics with accurate calculations and clear visual context. It is not a simple star finder; it is a focused ephemeris app for people who want to inspect how the sky behaves over time and across Earth.