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Sky-Tonight.com / Brightest Stars / Castor
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Observation Settings

Or select it on the map:
This Earth map fragment is intended to illustrate celestial motion across the sky, emphasizing both bearing and elevational perspectives. The map's center point corresponds to the transit, showcasing celestial objects at their highest point, while elevation gradually decreases towards the map edges. This dynamic representation offers insights into the changing positions of celestial bodies with a focus on their bearing and elevational trajectories.
Your location: Columbus, United States
Timezone:
Latitude:
39.9625
Longitude:
-83.0061

Castor Observation Details

Castor

Castor Daily Motion

Castor will reach transit at 16:20. By the time twilight starts at 22:08 it will be at an elevation of 22° degrees and will set at 00:24, before twilight ends.
Castor will become visible in August, 24. After being too close to the Sun to observe, it will reappear in the night sky. Starting from August, 24, Castor can be seen again, providing a good opportunity for observation.

Castor Visibility Timetable on June 03

Castor Rise and Set Timetable

TimeElevation
Moon Rise, 45.6% illuminated12:4947°
Castor transit16:2082°
Sunset20:5435°
Civil sunset21:2729°
Astrosession begin22:5514°
Castor set00:24
Moon Set02:10-12°
Astrosession end04:04-18°
Castor rise08:12

Track Castor Position Throughout the Night

← Tue, 3 June 2025 →

Elevation (degrees)
Time
Altitude
Azimuth
Shift the map to change the time and observe Castor changing position in the night sky.

Castor - Multiple Star System

Castor is the second-brightest star in the constellation Gemini and the twenty-fourth-brightest star in the night sky. It is a multiple star system located about 51 light-years away from Earth.

Castor has an apparent magnitude of 1.58 and consists of six main stars. It is one of the most prominent stars in the winter sky in the Northern Hemisphere.

Finder Chart for Castor

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Object nameCastor
Field of view
Limiting magnitude
Castor coordinates7.576633999999999, 31.888276
Center coordinates7.576633999999999, 31.888276

Castor Passage Through Night

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Current position of Castor

Time10:23
Latitude39.9625
Longitude-83.0061
Castor elevation20°
Castor Azimuth-65°
Here you can see the current position of the Castor on the map, as well as its positions for rise and set. This tool allows you to track the Castor's movement throughout the night, providing you with accurate and up-to-date information.

Annual motion of Castor

Time
DateTue, 3 June 2025
Twighlight start22:50
Twighlight end03:59
Twighlight duration5h 9m
Rise08:12
Set00:20
Elevation at transit82°
Transit time16:16
Equatorial coordinatesRA: 07h 34m 35s", Dec: 31° 53' 17s
Magnitude2
ConstellationGemini
The graph illustrates the annual visibility pattern of a Castor, providing a comprehensive overview of its daily appearances and transit times throughout the year.
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the Castor is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit.