Targets
Add one at a time, paste a batch, or upload a CSV. J-names are parsed as coordinates locally — no network needed. SIMBAD name resolution is coming in the next pass.
Single target
Batch / CSV
Accepts
IAU J-names, HH:MM:SS ±DD:MM:SS, or RA_deg Dec_deg. Prefix with an optional name like MyTarget J123456.7+012345.Lines starting with
# are comments. Columns auto-detected by whitespace, comma, or tab.| Target | RA (J2000) | Dec (J2000) |
|---|
Airmass & Altitude Through the Night
Altitude on the left axis, airmass on the right. Hover for time readout. Shaded bands show civil / nautical / astronomical twilight. The dashed moon track shows the moon's altitude when it's above the horizon. Click any summary card below to isolate that target on this plot.
Add targets above to render the night.
Civil twilight
Nautical twilight
Astronomical dark
Moon altitude
Airmass limit
Min altitude
2.00
20°
30°
1.00 h
Per-target Summary
Transit time, rise/set within the night, observable hours against your constraints, closest moon approach, and any violations. Everything updates live as you move the sliders.
Add targets to see their observability.