- The new moon is when the moon is in between the sun and the earth
- The new moon is when the dark half of the moon faces the earth
- Hence, the new moon is when the moon could block the earth from the sun

- The new moon is when the moon could block the earth from the sun
- A solar eclipse is when the moon blocks the earth from the sun
- Therefore, a solar eclipse could only happen during the new moon

Hence, a solar eclipse could only happen during the new moon
Q: During which phase of the Moon could a solar eclipse take place?
Context:
- The new moon is when the moon is in between the sun and the earth 
- A solar eclipse is when the moon blocks the earth from the sun 
- The new moon is when the dark half of the moon faces the earth