When the moon is at its full or new moon phase, high tides are at their highest, while low tides are lower than usual. Called spring tides, these tides occur when the sun, moon and the Earth all line up. The added gravity of the sun can make the oceans bulge more than at other times. Rest of the detail can be read here.
During a lunar eclipse, the Sun and Moon are on opposite sides of the Earth, the Sun will tend to cancel some of the effect that the Moon has on the earth, but you can still expect high tide to occur during a lunar eclipse, but it will be slightly less than if the Sun were not on the opposite side of the Earth.
What effect does the Moon have on the tides?
The tides are the result of the moon exerting its gravitational force on the ocean and bulging it both toward and away from the moon. The tide is higher, the ocean is higher, at the location closest to the moon and on the opposite side of the Earth. As the Earth rotates, the position relative to the moon changes, so the bulge moves.
The ocean tides on earth are caused by both the moon’s gravity and the sun’s gravity. Even though the sun is much more massive and therefore has stronger overall gravity than the moon, the moon is closer to the earth so that its gravitational gradient is stronger than that of the sun.
Another frequent inquiry is “Are tides higher when the Moon is directly overhead?”.
Tide-generating forces are also enhanced when the moon is directly overhead at the equator, part of a cycle lasting 27.2 days Spring tides are always higher at these times of year.
What is a lunar eclipse and how does it happen?
During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon. There are two kinds of lunar eclipses: A total lunar eclipse occurs when the Moon and Sun are on opposite sides of Earth. A partial lunar eclipse happens when only part of Earth’s shadow covers the Moon.
There are two kinds of lunar eclipses: A total lunar eclipse occurs when the Moon and Sun are on opposite sides of Earth. A partial lunar eclipse happens when only part of Earth’s shadow covers the Moon. During some stages of a lunar eclipse, the Moon can appear reddish.
You could be thinking “Why don’t lunar eclipses happen twice a month?”
Understanding Lunar Eclipses A lunar eclipse occurs when the Moon passes through the Earth’s shadow, just as a solar eclipse occurs when part of the Earth passes through the Moon’s shadow. So why don’t eclipses happen twice a month? The reason is that the Moon’s orbit around the Earth is tilted relative to the Earth’s orbit around the Sun.