Choose an era and a place
2026
Date
Place
Start
Demo mode
Opens at 21:00 local mean time, facing south. Drag to look around, wheel to zoom, click a star to identify it.
REAL SKY
Real sky
Demo
Time
Pause
Date
Time
Local mean time
UTC
Calendar
Auto (Julian before 1582)
Julian
Gregorian
Now
−1d
−1h
+1h
+1d
Year
−100y
−1y
−1m
+1m
+1y
+100y
Time rate
Rate:
1×
Place
Place
Lat / Lon
Free view: click the globe to pick a place
Sky events
Go to
Moon meets
◀
▶
Local sidereal time:
-
Sun alt / az:
-
Moon:
-
Pole star:
-
View az / alt / fov:
-
Display
Xingguan lines
Xingguan names
Planets (五星)
Bright star names
Meridian
Celestial equator
Ecliptic
Moon
Clouds layer
Equator
Pause
Observer view
Reset camera
Demo mode (advanced)
Day length (s)
Orbit speed (real = 100)
Rotation speed (real = 100)
Moon speed (real = 100)
Reset real ratios
Observer latitude (observer view)
Annual view (fixed local time)
Orbit path
Show Earth’s tilt axis
Polaris
Polaris hint line
Big Dipper
Dipper pointer line
Sun light rays
Background stars
Go to:
Orbital angle:
0.0°
Today:
-
Day of year:
1
/ 365 ·
-
Hour of day:
0.0
h
Orbit:
Rotation:
Moon:
Render rate:
-
fps
❚❚
Real time
1 min/s
Wheeling sky
Precession
Now
Tonight
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