Celestial coordinates
The calculation uses a sidereal day of 23.93447 hours, an ecliptic inclination of 23.44°, a solar year of 365.256363004 days and a lunar period of 27.321661 days.
Interactive laboratory
Sky Dome Model
Vary the day, time and position of the observer. The model shows how the coordinates of the Sun, Moon and stars calculated in the celestial system are projected onto a plane and a conditional dome.
Local version
Drag to rotate · wheel to zoom
Model date—
UTC time—
Sun—
Moon—
Projection onto the dome
The latitude of the celestial object determines the distance from the center of the dome, the longitude determines the direction, and the height is obtained from the equation of the elliptical dome.
Model limitation
This is a visual projection, not an independent flat cosmology. The phases of the Moon and the positions of objects are derived from the spatial relationships of the Sun, Earth and Moon.
Source and attribution
Based on Walter Bislin's FE-Dome App
The local implementation retains the basic published constants and coordinate transformations, but uses its own adaptive Canvas renderer. The original work is marked as Public Domain by the author.