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heliacal British & World English

Relating to or near the sun

heliacal rising British & World English

The rising of a celestial object at the same time as the sun, or its first visible rising after a period of invisibility due to conjunction with the sun. The last setting before such a period is the heliacal setting

heliacal setting in heliacal rising British & World English

The rising of a celestial object at the same time as the sun, or its first visible rising after a period of invisibility due to conjunction with the sun. The last setting before such a period is the heliacal setting

heliacal New Oxford Dictionary for Writers & Editors

denoting the first rising of a star or planet which occurs at the same time as the rising of the sun;