Reveals the constellation's ties to the Hercules myth, and presents a guide to viewing the asterism's double stars and Messier objects.

Brief encyclopedia entry explains where the constellation's name came from.

Find a photo of the crab-shaped asterism, and guides to viewing its deep-sky objects. Includes a short description of the constellation.

Browse through constellation data and skylore on Cancer. Includes a constellation chart and details on nearby star clusters.