Alcyone Ephemeris is an accurate and fast astronomical ephemeris calculator covering the period 3000 BC to AD 3000. It calculates heliocentric, geocentric, and topocentric positions of the Sun (Earth), Moon, planets, small bodies (asteroids, comets), and fixed stars in ecliptical, equatorial, and horizontal coordinates (including angular differences between two bodies), with optional corrections for parallax and refraction.
Presents a deceptively simple 3-color graph that tells, at-a-glance, when a planet (or moon, sun) is visible from your location. The vertical axis marks the months of the selected year, with the horizontal axis marking the 24 hours of the day (in local time). The three colors create a contour map effect and identify when the selected object is visible, not visible, or "eclipsed" by the sun. In addition times of solar and lunar eclipses are marked
