What point, defined by Newton, is at the focus of the moon’s orbit?
What point, defined by Newton, is at the focus of the moon’s orbit?
How does the Earth move with respect to this point?
What causes the two “tidal bulges” of the Earth?
How often do most locations on Earth experience “high tide”? When do the highest high tides occur?
How do the moon and Earth affect each other’s rate of rotation?
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What point, defined by Newton, is at the focus of the moon’s orbit?
The barycenter (center of mass) of the Earth and Moon.
How does the Earth move with respect to this point?
It wobbles in its own ellipse every month (of a semimajor axis of about 0.7 Earth radii), because gravity is a TWO WAY STREET
What causes the two “tidal bulges” of the Earth?
The non-uniform gravitational field of the moon. It pulls more on the near side of Earth than it does on the far side. It pulls its bulk force on the center of Earth.
The far side of Earth "lags" away from the center of Earth, and the near side of Earth is "lifted" by the gravity of the moon.
How often do most locations on Earth experience “high tide”?
High tide repeats about every 12 hours and 25 minutes.
When do the highest high tides occur?
Highest high tides and lowest low tides occur during a condition called "spring tides".
The TRIGGERING PHASE of the moon on spring tides is the New Moon and the Full Moon.
Shortly after New Moon and shortly after Full Moon, the spring tides occur.
The reason for "shortly after" is the inertial lag of the ocean.
This can be ENHANCED by the moon being at orbital perigee during either of these phases.