Refers to the well-known asterism of seven stars in Ursa Major. Used in both everyday and astronomical contexts.
See also: 北斗七星
Tonight the Big Dipper is clearly visible.
the seven classical planets
Historical astronomical term for the seven celestial bodies visible to the naked eye: Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn. Rare in modern usage outside historical or astrological contexts.
See also: 七曜 (しちよう)
Let's look for the Big Dipper in the northern sky.
In ancient astronomy, the seven stars referred to the sun, the moon, and the five planets.