The Moon does far more than light up the night sky—its gravitational interaction with Earth drives our climate, controls ocean currents, and actively slows down our planet’s rotation!
Here is the complete scientific breakdown across 4 key dimensions:
1. Lunar Geometry & Eclipse Alignments
- The Moon’s orbit is tilted at 5.1° relative to the ecliptic plane, intersecting at „Nodes“ where Solar and Lunar eclipses occur.
- Synodic Month (Phase to Phase): 29.5 Days | Sidereal Month (Orbital Period): 27.3 Days.
2. Lunar Tides & Tidal Braking (Earth’s Spin Slowing Down)
- Because Earth rotates faster than the Moon orbits, Earth pulls the tidal bulge ahead („Leading Tidal Bulge“).
- The Moon exerts gravitational torque on this bulge, acting as a brake that lengthens Earth’s day by ~2 milliseconds every century.
- By conservation of angular momentum, this pushes the Moon outward into space at ~3.8 cm per year!
3. Global Ocean Circulation & Tidal Regimes
- Gravitational pull interacts with Coriolis force and basin shapes to create Diurnal (1 high/low per day), Semidiurnal (2 equal highs/lows), and Mixed Tides.
4. Amphidromic Systems (The Zero-Tide Points)
- Ocean tides rotate around fixed nodes called „Amphidromic Points“ where the tidal range is practically ZERO! Tidal amplitude increases outward along rotating cotidal lines.
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→ Exam Fact: The slowing of Earth’s rotation due to tidal friction proves that 600 million years ago, an Earth day was only about 21 to 22 hours long!
→ Learn, Practice, and Grow with Class360! Download our app for complete Physical Geography & Oceanography revision notes.
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