It is narrated from Sayyiduna Abu al-Darda' (may Allah be pleased with him) that he said: The most beloved to Allah of the servants of Allah Almighty are those who love Allah and make Allah beloved to the people, and those who watch the sun, the moon, the stars and the new moons for the remembrance of Allah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1782