Directions: Explain how these phenomenon/heavenly bodies led to the discovery that the earth is spherical 1. North Star 2. The Shape of the Sun and the Moon 3. Disappearing Ships 4. Lunar eclipse

Explanation:
1. The North Star has different positions depending on the location of the observer.
2. The Moon and the Sun are both spherical.
3. A sailing ship becomes smaller and then its hull disappears first before the sail as
if it is being enveloped by the water until it completely disappears.
4. The Earth casts a circular shadow on the Moon during a lunar eclipse.