Comic Discussion > ALICE GROVE
Alice Grove MCDLT - February 2017
Neko_Ali:
--- Quote from: Kugai on 19 Feb 2017, 21:47 ---OMG!!!
IT'S A JURAIAN TREE SHIP!!!!!
Meah!! :-D
--- End quote ---
I've been thinking this ever since it was pointed out the tree connection to Prases.
jheartney:
--- Quote from: Zebediah on 20 Feb 2017, 06:17 ---It's probably not that big, because if it was big enough to cause a noticeable eclipse it would also be easily visible from the ground.
--- End quote ---
It would definitely be visible from the ground. The International Space Station (which is closer in size to one of those floating leaves) is visible from the ground. These tree things would be easily visible, even if they weren't Moon-sized.
From the size of the Earth at the bottom of the page, I think we're not far enough away from the planet to be in geosynchronous orbit. But we're higher than the near-Earth orbit where the ISS lives.
A small perverse otter:
--- Quote from: USS Martenclaire on 20 Feb 2017, 01:03 ---I had a thought. Depending on whether the tree is in geostationary orbit and its mass relative to the moon, its quite possible that the planet would experience arboreal eclipses as the tree passes in front of the moon and the sun.
--- End quote ---
In principle, there's a way to estimate the orbital radius of the tree by looking at the curvature of Earth's image as seen from the spaceship (assuming that the flyer is in roughly the same orbit as the tree), since the radius of the resulting circle can be estimated from its curvature. Given the apparent radius, we can then compute the distance between Earth's center and the spaceship by a straightforward application of plane analytic geometry.
That would permit anyone to determine whether the tree is in geosynchronous orbit.
jheartney:
--- Quote from: A small perverse otter on 20 Feb 2017, 08:28 ---In principle, there's a way to estimate the orbital radius of the tree by looking at the curvature of Earth's image as seen from the spaceship (assuming that the flyer is in roughly the same orbit as the tree), since the radius of the resulting circle can be estimated from its curvature. Given the apparent radius, we can then compute the distance between Earth's center and the spaceship by a straightforward application of plane analytic geometry.
That would permit anyone to determine whether the tree is in geosynchronous orbit.
--- End quote ---
That would depend on the focal length of the "camera" used in the making of the image. A telephoto lens would foreshorten distances, making the planet seem nearer, with a larger apparent radius. A wide-angle lens would have the opposite effect.
Granted, these are drawings rather than photos. But the principle is the same: apparent radius is a subjective quality based on foreshortening, as chosen by the artist.
Welu:
Das a very big tree.
I'm worried for Gavia. That looks like fear on her face to me.
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