The phrase "lamp of the day" typically refers to the sun, as it provides light for the majority of the day. However, there are many other ways to describe this glowing orb in the sky. Some synonyms for the sun include "daystar," "helios," and "solar disk." Additionally, cultures around the world have their own unique names for the sun, such as "Ra" in Egyptian mythology and "Amaterasu" in Japanese mythology. Other ways to describe the sun might include "heavenly beacon," "celestial fireball," or "the great illuminator." No matter how you refer to the sun, it remains a powerful force that provides light and warmth to all living beings on Earth.