When the Earth is furthest from the sun (aphelion), around July 2, the tidal ranges are reduced (Sumich, J.L., 1996 Thurman, H.V., 1994). When the Earth is closest to the sun (perihelion), which occurs about January 2 of each calendar year, the tidal ranges are enhanced. A similar situation occurs between the Earth and the sun. About two weeks later, when the moon is farthest from the Earth (at apogee), the lunar tide-raising force is smaller, and the tidal ranges are less than average. Once a month, when the moon is closest to the Earth (at perigee), tide-generating forces are higher than usual, producing above-average ranges in the tides. Because the moon follows an elliptical path around the Earth, the distance between them varies by about 31,000 miles over the course of a month. Just as the angles of the sun, moon and Earth affect tidal heights over the course of a lunar month, so do their distances to one another. During each lunar month, two sets of spring and two sets of neap tides occur. One week later, when the sun and moon are at right angles to each other, the solar tide partially cancels out the lunar tide and produces moderate tides known as neap tides.
MOON PHASE TIDE GRAPH FULL
When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides - both commonly called spring tides.
Together, the gravitational pull of the moon and the sun affect the Earth’s tides on a monthly basis. Casio LWS-1100H-2A Sport Digital Moon Phase Tide Graph Blue Resin Watch 100 Meter / 10 Bar Water Resistant Tide graph / Moon Phase Silver Resin Case.
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