esoteric
发表于 2025-3-23 11:56:19
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GULF
发表于 2025-3-23 14:31:20
Advanced Project: Variable Starsan organization called the American Association of Variable Star Observers (AAVSO), in existence for more than 80 years, that has as its sole purpose these collection of observations of these variable stars by amateur astronomers.
frenzy
发表于 2025-3-23 19:44:45
Telescopes for Children“Which telescope shall I buy for my child?” We have heard his same question many, many times, and it is a good one. It is also a very difficult one to answer.
ostensible
发表于 2025-3-24 02:15:50
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pancreas
发表于 2025-3-24 04:14:58
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感情脆弱
发表于 2025-3-24 09:25:21
Advanced Project: Observing MeteorsIf you can get a group of children together near the time of one of the major annual meteor showers (see chapter 10), getting them to observe it is a learning experience that can be a lot of fun.
conscience
发表于 2025-3-24 13:33:18
Ideals Are Like Star: An Introductiony means. A newborn child has its own pretty definite concept—centered on itself and extending to a room and a familiar face. As the child grows, its environment expands to take in a house and a street. With early education those surroundings quickly stretch to a country and a world.
HEDGE
发表于 2025-3-24 17:58:28
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乏味
发表于 2025-3-24 22:23:47
Cultures and Constellations cultures. These patterns or constellations include such creatures as a bear, a hunter, a dragon and serpents, and a giraffe. Although some bright stars have been given several different names, most of the commonly used ones derive from the early Arabs and Greeks.
BUCK
发表于 2025-3-25 02:13:53
Keeping an Observing Logerica’s great writers, and not coincidentally one of the most astute observers of nature who ever lived, Thoreau made a point of observing the physical world around him and keeping a journal in which he recorded what he saw. Thoreau thought deeply about his experiences. “Both place and time were cha