New Moon + Lunar Perigee = Spectacular Tides

Tomorrow (May 5) at 5:18 PDT, there will be a new Moon. It means that the Moon is passing the Sun in the sky. It is daytime, so you will not see the Moon, but it is up there about 8 degrees above the sun, as indicated in the first image. Click the thumbnail to see the full image.

What makes this unusual is that only 3 hours later, the Moon is at its closest point in its orbit around the Earth. It will be only 357,771 km away. The combination of the new Moon (the Sun and the Moon in the same direction in the sky), plus the closeness of the Moon, means that we can expect some spectacular tides. Here are the charts for Point Atkinson. The first shows the pattern of tides from May 5 to May 8, and the second is just for May 5.

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2 Responses to “New Moon + Lunar Perigee = Spectacular Tides”

  1. 1 Robert May 5, 2008 at 6:47 am

    If those tide charts are of interest to you, I have the Tide and Current Predictor posted at my Backcountry Weather Resources page.

    Scroll down to the section: Surface Maps. The two choices are the Local Tide Chart (which is Point Atkinson), and Skookumchuck Narrows Current. However, once you have the Predictor up, you can change the parameters to show tides and currents everywhere in the world.

  2. 2 Robert Ballantyne May 5, 2008 at 8:09 am blogs have a new feature. For people who comment and do not have their own avatar, the WordPress software will create a unique one based on the IP address. It is called an identicon and they are popping up at various sites on the Internet. I just turned on this feature for Salish Sea and I’m curious to see what would happen if I were to comment here without signing in.

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