Four Moon Night

There are four moons in this picture. One on the lower left, and three in the upper right.

Zooming in, we can see Jupiter and three of his moons.

And of course our moon.

Hundreds of years ago, sailors used charts of the moons of Jupiter to determine what time it is. By knowing the time, they could use star charts for navigation.

Had modern climate scientists been in charge of these charts, sailors probably would have sailed off into the abyss. Just like they are doing to government and civilization.

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14 Responses to Four Moon Night

  1. Steve Case says:

    Oh yes, navigation by the stars the moon and God knows what to find your way. Not an easy thing to do. Note the navigation bubble on the top of this old airplane:

    • Steve Case says:

      Navigation wasn’t without its hazards:

    • RAH says:

      During WW II celestial navigation was taught to all navigators for US and British aircraft bombers and transports. The Germans however failed to train most of their navigators in celestial navigation in their bombers. Most of the crews were “goose step” pilots just following their leader. And during the Battle of Britain that made it easier for the British fighter pilots to score because many German pilots would not take too much evasive action because they were afraid they would get lost. And during “The Blitz” when the Germans had turned to night bombing that is why the Germans had to rely exclusively on various radio systems to guide their crews to their targets and of course the British figured out those systems and learned to distort them.

      The SF land navigation course was the toughest in the world at the time but we were not trained in celestial navigation. However later we had to be trained in it because navigation in deserts and of course the cold snowy steppes where terrain features can be nearly nonexistent required it. BTW the desert rats (The forerunners of the SAS) of WW II found their way around the Sahara using celestial navigation.

  2. Steven Fraser says:

    My dad was a Navigator in the RCAF at the end of WWII. He described the triangulation process used, and how important it was when heading home, at night, over the ocean.

  3. R Shearer says:

    Fantastic pictures!

    In earlier times, skeptics denied the concensus that the earth was the center of the universe.

  4. RAH says:

    Glad your trying your hand at astrophotography. Can’t wait to see what you can do with Saturn and it’s rings.
    A resource that may help you. They’ll make a note when Saturn’s rings are at a good angle for observation and when other interesting things are going on in the night sky. For example under “This Week’s Sky at a Glance” you’ll see there are currently three comets that can be viewed with binoculars right now. Don’t know if you zoom can get them or not?

  5. Mark Luhman says:

    Here is what I captured from my P900 last time I had it out. I tried to catch the moon as it set, I was to old and slow for that and maybe a better tripod might help I shake to much even for the p900 to get a good shot hand held. I did get on shot I somewhat like. It is attached.

  6. Mark Luhman says:

    I then turn my attention to Jupiter and I got four of her moons , everything is overexposed something I will try to correct the next time I go out. I purchase the p900 after seeing your shot several times. Thanks Tony for all the information you provide and the good work you are doing.

  7. Ernest Bush says:

    My group at work had access to cameras designed for data collection attached to an 80-inch folded mirror telephoto. Our pictures looked like yours until we put a cardboard disk with a hole in it to the front of the lens to cut down light gathering by at least two f-stops. Then we were able to take videos of both Jupiter and Saturn visualizing Jupiter’s bands and the rings of Saturn in color while still registering the moons. Got up to 5 of Jupiter’s moons. We also had autotracking of the image, however. It kept us occupied when we had to be on the desert at 3 a.m.

    • Mark Luhman says:

      The P900 has manual settings in it and since Jupiter is on full sun light I will start with the sunny 16 rule and work back from there since Jupiter is so far from the sun the sunny 16 rule is only a guide it may be two or more stops off. The auto-expose as you will know tries to make everything 16% grey, modern cameras are better than that but as you learned the large area of black still causes problems. Yes I did take these picture in the desert,

  8. TimboA says:

    “Had modern climate scientists been in charge of these charts, sailors probably would have sailed off into the abyss. Just like they are doing to government and civilization.”
    I wish they had a sarcasm Acadamy Award….you’d certainly take home top prize!!….HaHa

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