sun moon

Should Sun And Moon Be Capitalized? “Capitalize the names of planets (e.g., ‘Earth,’ ‘Mars,’ ‘Jupiter’). Capitalize ‘Moon’ when referring to Earth’s Moon; otherwise, lowercase ‘moon’ (e.g., ‘The Moon orbits Earth,’ ‘Jupiter’s moons’). Capitalize ‘Sun’ when referring to our Sun but not to other suns. Is Sun and moon a proper noun? Sun, Earth and Moon