When the sun, the moon and the earth are in a straight line,

Cause:
When the Sun, Moon, and Earth are aligned in a straight line (during new moon and full moon phases), the gravitational pull of the Sun and the Moon combine.
Effect:
This combined gravitational force produces higher high tides and lower low tides than usual.
Name Origin:
The term “spring” does not refer to the season, but to the idea of the tide “springing forth” or rising higher.
Opposite Phenomenon:
When the Sun and Moon are at right angles to the Earth (during quarter moons), their gravitational forces partially cancel each other out, producing Neap Tides (lower tidal range).
Answer: When the Sun, Moon, and Earth are in a straight line, the higher tides are called Spring Tides.