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  1. Janus

    Effects of a Change of Direction of the Rotation of the Earth?

    As already mentioned, greater variance in seasons would be a result. In the diagram below the top image is what things are like in the present. The rotational axis is the the arrow passing the green sphere ( Earth) as it orbits the Sun, The Earth is shown at opposite sides of its orbit...
  2. Janus

    Hawaii's Kilauea volcano eruption

    Well are. Have seen some great scenery, saw green sea turtles basking on beaches of two islands, and even caught sight of a dolphin jumping out of the water during breakfast the other day. Am spending the afternoon of our last night at hotel watching the waves crash against the rocks, before...
  3. Janus

    Hawaii's Kilauea volcano eruption

    Good. Assuming this is caused by Kilauea, it's a bit ironic that I had to go away [\i] from the volcano to see volcanic related activity.
  4. Janus

    Hawaii's Kilauea volcano eruption

    Today we drove north and were able to escape the vog. While there we saw what looked like a tall cloud to the south. It grew taller as we watched. It was in the direction of the volcano , and I understand that there was another eruption today, so this might have been associated with it. I...
  5. Janus

    Hawaii's Kilauea volcano eruption

    Update from the island of Hawaii. Since we've arrived, we've been dealing with a bit of vog. Visibility has been low. Of course they are not letting tourists into the active area (and I don't believe my PF ex-mentor status would pass muster as press credentials. ) Yesterday we drove down to...
  6. Janus

    Hawaii's Kilauea volcano eruption

    IN India During the summer of '81 I was taking flying lessons out of Kelso , WA. They were making sightseeing tours by plane over the mountain. One of my solo flights was to Yakima, WA , which took me right past St. Helens, so I got to view the crater and devastation from the air.
  7. Janus

    Hawaii's Kilauea volcano eruption

    Well. my flight for Maui leaves in just a few hours. If all goes to plan, I'll arrive on the Big Island on Saturday. If there is a steam/ash explosion while I'm there, that will be the second time in my life of being within 50 miles or so of such an event. (I lived some 40 miles as the crow...
  8. Janus

    Hawaii's Kilauea volcano eruption

    Since the last time I posted, they have re-opened parts of the Volcanoes National park, so this is good news. No matter what, I'm sure we'll have a good time ( Of the two of us, it's my wife that is the worry-wort). However, now they are predicting thundershowers in Kona on the day of our...
  9. Janus

    Hawaii's Kilauea volcano eruption

    Er, no. Its just that the vast majority of it is below sea level and it is only the top that is sticking out. Mauna Kea is 33,000 ft above the ocean floor. At sea level you are still some 19,000 ft above the base.
  10. Janus

    Hawaii's Kilauea volcano eruption

    Well, there's active and there's ACTIVE. Too much activity and you probably would not be able to get close enough to see anything. The last I heard they had closed the Hawaii Volcanoes Nat. Park for safety reasons.
  11. Janus

    Hawaii's Kilauea volcano eruption

    It's the 2nd island of a two island trip, Maui for 5 nights and 5 nights in Kona. This means that the return flight is booked out of Kona. I'd really rather not have to cut the trip short and rebook out of Maui at this late date. At least we will be on the other side of the island. I think we...
  12. Janus

    Hawaii's Kilauea volcano eruption

    Well, my timing could have been better. We are scheduled to arrive on the big island two weeks from today. (Trip planned and booked months ago.)
  13. Janus

    Is the Earth magnetic?

    Because gravity behaves differently than magnetism does in many ways. For example, the North poles of two magnets will repel each other, while there is no equivalent repulsion effect with gravity. Another example. with magnetism, the strength of the attraction or repulsion depends on the...
  14. Janus

    Why doesn’t the water fall out of the Earth?

    In a sense, yes. Though tides are due to gravitational differential rather than direct gravitational pull. For instance, if we were to move the Earth to an orbit 3,686856 km from the Sun (center to center distance), then the gravitational pull from the Sun on a object sitting on the surface of...
  15. Janus

    Is the Earth really round?

    Would you consider a billiard ball as being spherical? If so, if you were to scale the Earth down to the size of billiard ball, the roughness of it surface due to mountains a valleys would be less than the manufacturing tolerances for irregularities for a billiard ball. Even including the...
  16. Janus

    Intelligent life other than on Earth

    I voted "possible". We know intelligent life is possible in the universe as we are living proof. But since we are the only known case, we have too small a sample to provide us with any indication of how likely this is to occur in the universe.
  17. Janus

    True North vs Magnetic North

    I've got at National Geographic map of Glacier National Park. It gives the magnetic deviation at the time of printing (2009) and the approximate change in deviation per year to keep it up to date.
  18. Janus

    True North vs Magnetic North

    What you need to do is look up the magnetic declination for where you live. This is the difference between true North and the direction a compass needle will point. For instance, the magnetic declination for where I live in Portland, OR is +15 degrees 20 min. Here's a site that will give you...
  19. Janus

    Insights Measuring How Many Days Are in a Year - Comments

    Janus submitted a new PF Insights post Measuring How Many Days Are in a Year Continue reading the Original PF Insights Post.
  20. Janus

    Earths shadow on the moon.

    The tolerance for irregularities on a billiard ball is 0.127 mm. This falls in the range of the thickness of a black hair (blond hair is finer).
  21. Janus

    Earths shadow on the moon.

    Here's an old example that might help answer your question. If you were to scale the Earth down to the size of a billiard ball, the Earth would be smoother than a billiard ball, mountains and all.
  22. Janus

    Could Earth be shrinking?

    Mars' surface is dotted with extinct volcanoes, lava plains and other evidence of being geologically active in the past.
  23. Janus

    Battlefield Earth and scientology? huh?

    Well I wouldn't say that it was a promotional piece in the manner of overtly pushing the teaching of Scientology, but more along these lines: They were betting that some of the people who saw the movie would like it enough to read the book, which in turn would lead them to reading other...
  24. Janus

    Battlefield Earth and scientology? huh?

    "Battlefield Earth" was originally a novel written by Ron L. Hubbard, the founder of Scientology(the only reason Travolta did the film). I'm not sure that there is any overt Scientology pushing in the novel, but you might find some parallel themes. About the only real connection I do know of...
  25. Janus

    Seasons are due to the tilt of the Earth. Really?

    As already stated, the difference in radiant heating due to eccentricity is about 6% (94% at aphelion vs. 100% at perihelion) Now consider a point on the Earth's surface at a lattitude of 23 degrees. During the summer the sun is directly overhead and in winter it is 46 degrees from vertical...
  26. Janus

    What causes moon to change its shape.

    Yes. What you need to remember is that that Moon's orbit is tilted with respect to the Earth's orbit around the Sun, Thus most of the time during a full moon, the moon passes "above" or "below" the Earth's shadow. It is only during the rare times when Moon is passing through or near enough to...
  27. Janus

    Mass Of Earth

    To put it in even more perspective: Even if you imagined that the whole Earth, oceans included, was covered with people at a population density equal to that of Tokyo, the total mass of humanity would still only be about 2x10^{16} kg. Compare that to the mass of the Earth, 6x10^{24} kg ,and...
  28. Janus

    Mystery Bulge in Oregon Still Growing

    Considering that Bend is already at an elevation of 3,623', is about 150 miles from the coast, and has the Cascade mountain range between it and the Pacific, wouldn't that be overkill?
  29. Janus

    Will we ever get to the center of the earth?

    Even though the core is hot enough for it to be molten, it is under such high pressure that it is actually solid.
  30. Janus

    Will we ever get to the center of the earth?

    While rock is not as compressable as air, it is compressable. Estimates place the density of the center of the Earth at 13 g/cm^2, over six times that of the crust. The biggest problem would be pressure, at 3.5 million atmos. It doesn't matter that the local gravity decreases with depth...
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