When Is Castor Visible During the Year?

See how Castor visibility changes through the year from your location. The graph shows its seasonal observing windows, while the table gives rise, transit and set times for selected dates.

Castor will remain visible until May 27, when it moves too close to the Sun and temporarily disappears from the night sky.

Best Months to See Castor

Based on the amount of time Castor is above the horizon during dark or twilight hours, the strongest observing months in the next year are January 2027, December 2026, February 2027.

Castor Visibility Throughout the Year

Castor visibility on 2026-09-15

Castor Visible from before midnight until sunrise

Castor rise and set timetable

	Time	Elevation
Castor transit	07:07	85°
Moonrise, 9.3% illuminated	08:37	71°
Castor set	14:59
Astronomical observing session begins	18:45	-21°
Moonset	18:55	-21°
Castor rise	23:11
Astronomical observing session ends	03:21	44°
Twilight end (−12°)	03:53	51°
Civil sunrise	04:23	57°
Sunrise	04:51	62°

Track Castor position throughout the night

← 15 September 2026 →

Time
Altitude
Azimuth

Shift the map to change the time and observe Castor changing position in the night sky.

Castor Rise, Transit and Set Times by Date