When Is 21 Boo Visible During the Year?

See how 21 Boo 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.

21 Boo will remain visible until October 24, when it moves too close to the Sun and temporarily disappears from the night sky.

Best Months to See 21 Boo

Based on the amount of time 21 Boo is above the horizon during dark or twilight hours, the strongest observing months in the next year are December 2026, January 2027, November 2026.

21 Boo Visibility Throughout the Year

21 Boo visibility on 2026-11-06

21 Boo Visible from sunset until before midnight

21 Boo rise and set timetable

	Time	Elevation
21 Boo is always above the horizon
Moonrise, 18.4% illuminated	22:13	12°
21 Boo transit	06:48	79°
Moonset	10:25	51°
Sunset	12:23	33°
Civil sunset	12:53	29°
Twilight start (−12°)	13:25	25°
Astronomical observing session begins	13:57	21°
21 Boo is always above the horizon
Astronomical observing session ends	00:34	29°
Twilight end (−12°)	01:06	33°
Civil sunrise	01:38	38°
Sunrise	02:08	42°

Track 21 Boo position throughout the night

← 6 November 2026 →

Time
Altitude
Azimuth

Shift the map to change the time and observe 21 Boo changing position in the night sky.

21 Boo Rise, Transit and Set Times by Date