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Sky-Tonight.com / Constellations / Cancer
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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

Cancer Constellation

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Cancer, the crab, is a small constellation in the zodiac, known for its dim stars and the open cluster Praesepe, or the Beehive Cluster.

Cancer (The Crab)

Cancer is one of the 13 ecliptic constellations and represents a crab in Greek mythology. Though it is relatively faint and lacks bright stars, Cancer is rich in history and mythological significance. It is best known for the famous Beehive Cluster located within its boundaries.

Key Features

  • Bright Stars: Cancer does not have exceptionally bright stars, but it includes:
    • Beta Cancri (Tarf): The brightest star in Cancer, an orange giant located approximately 290 light-years away.
    • Delta Cancri (Asellus Australis): A yellow giant star marking part of the crab’s body, also notable for its proximity to the Beehive Cluster.
    • Gamma Cancri (Asellus Borealis): A white star representing the northern part of the crab’s body.
  • Deep-Sky Objects: Cancer is home to one of the most famous star clusters:
    • Beehive Cluster (Messier M44): A bright open star cluster visible to the naked eye, often described as a "swarm of bees."
    • Messier 67 (M67): An older and more compact open cluster, containing thousands of stars and considered one of the most studied star clusters.

Mythological Background

In Greek mythology, Cancer is associated with the crab sent by Hera to distract Heracles during his battle with the Hydra. Despite being crushed by Heracles, the crab was honored by Hera and placed among the stars. Cancer’s story reflects themes of perseverance and loyalty, even in the face of overwhelming odds.

The crab also appears in Babylonian mythology, where it was linked to the Moon and water, symbolizing life, fertility, and renewal.

Cultural Significance

Cancer has been historically significant in marking the summer solstice in ancient times. The Tropic of Cancer, a line of latitude, derives its name from the constellation because the Sun once appeared in Cancer during the solstice. Although precession has shifted this alignment, the name persists as a reminder of Cancer’s role in early astronomy.

Cancer Rise and Set Timetable

TimeElevation
Moon Rise, 4.8% illuminated04:39-31°
Cancer Transit17:3767°
Moon Set19:3356°
Sunset20:4843°
Civil sunset21:2137°
Astrosession begin22:0029°
Cancer Set00:35
Astrosession end04:57-32°
Cancer Rise10:35

Track Cancer Position Throughout the Night

← Mon, 26 May 2025 →

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

Annual motion of Cancer

Time
DateTue, 27 May 2025
Twighlight start22:46
Twighlight end04:10
Twighlight duration5h 24m
Rise10:35
Set00:31
Elevation at transit67°
Transit time17:33
Equatorial coordinatesRA: 08h 20m 10s", Dec: 17° 02' 10s
Magnitude-
Constellation
The graph illustrates the annual visibility pattern of a Cancer, 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 Cancer 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.

Acknowledgements

We gratefully acknowledge the International Astronomical Union (IAU) for defining and standardizing the official constellation boundaries, which provide a consistent framework for celestial mapping.

Special thanks to Sky & Telescope Magazine and contributors Roger Sinnott and Rick Fienberg for their collaboration in producing the charts and tables. The constellation patterns, drawn by Alan MacRobert, were influenced by the work of H. A. Rey and thoughtfully adjusted to align with earlier traditions.