Quick how-to:
Date only β draws the geocentric sky for that day with north up (12 oβclock).
Date + latitude/longitude β enables the Orientation menu: Local noon puts the Sun at the top for that date/place; Sidereal (LST) aligns the meridian with the local sky; Fixed keeps north up.
Steps: (1) Enter date. (2) Optional: enter lat & lon. (3) Choose orientation. (4) Press Start. (5) Reset clears inputs and zeros all dials.
This is a clock view, not a ship. You enter only your birth date & time; the panel compares that to the CST cosmic date above and automatically computes relativistic and sidereal interpretations.
Cosmic comparison date comes from the CST Date field above. If empty, the clock will use today.
SR at rest: v = 0 β Ξ³ = 1 β Ξtβ² = Ξt
GR: Ξtβ² = Ξt Β· β(1 β 2GM/(r cΒ²))
Reference: Earth surface (M = 5.972Γ10Β²β΄ kg, r = 6.371Γ10βΆ m)
GR factor β(1 β 2GM/rcΒ²): β
GR Ξtβ² (Earth-surface clock): β
Sidereal day β 23h 56m 4.1s
Per-day drift (solar β sidereal): +00:03:55
Accumulated drift from birth β cosmic date: β
x = cos Ξ΄ Β· cos Ξ± y = cos Ξ΄ Β· sin Ξ± z = sin Ξ΄
Uses your latitude/longitude (if given) and birth time to estimate the sky direction overhead (or on the local meridian).
Right Ascension Ξ± (hours): β
Declination Ξ΄ (degrees): β
(x, y, z) β
(β,
β,
β)
t = d / c β for years, d β t (in light-years)
Cosmic interval |Ξt|: β years
Equivalent light-path d β β light-years
After conversion, this tells you roughly how far a photon could have traveled since your birth.