Dna262
发表于 2025-3-26 22:49:18
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独行者
发表于 2025-3-27 04:33:25
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欢乐中国
发表于 2025-3-27 06:48:24
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PSA-velocity
发表于 2025-3-27 11:44:03
Luminous Plants, Animals, and Stones,e color of the rays emitted is precisely the one to which our eyes are most sensitive and contains infrared, so that this beetle might be called a really ideal source of light, if only it would shine somewhat brighter!
弯弯曲曲
发表于 2025-3-27 16:40:07
Book 1993ht and color and reveals the myriad phenomena that may be observed outdoors with no more than a pair of sharp eyes and an enquiring mind. From the intriguing shape of the dapples beneath a tree on a sunny day, to rainbows, mirages, and haloes, to the colors of liquid, ice, and the sky, to the appear
镀金
发表于 2025-3-27 21:28:44
Light and Shadows, a pencil in front of one o f these spots, the line connecting pencil and shadow will indicate where the rays of light that form the spot come from; they are, of course, sunlight that falls through some opening in the foliage: all we see here and there between the leaves is a blinding ray of light.
Gleason-score
发表于 2025-3-28 00:42:29
Reflection of Light,tion and the horizon: within the tolerances of Observation, the angles are equal. If the moon is not too high in the sky, you may guess at the angles with the aid of a stick: holding the stick with a straight arm, make the tip just ‘touch’ the lower edge of the lunar disk and make the tip of your th
变形词
发表于 2025-3-28 04:00:29
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无能力之人
发表于 2025-3-28 08:49:43
Curvature of Light Rays in the Atmosphere,orizon. This accounts for the flattening of t he sun and the moon on the horizon. At sunset, the lower edge o f the sun’s disk appears, on average, 35 minutes of arc higher than it actually is, but the top edge, which is farther from the horizon, only 29. The flattening amounts, therefore, to 6 minu
Baffle
发表于 2025-3-28 13:30:49
The Eye,oors, you must first of all b e familiar with the instrument you use continually: your eyes. It is very enlightening to learn to distinguish between what nature actually shows us and what our eyes add to, or subtract from, it. And no surroundings are more favorable for studying the peculiarities of