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汪为青
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经纬网与地球仪
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卫星星下点轨迹
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月相原理
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太阳视运动
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晨昏圈与昼夜长短
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太阳直射点纬度变化规律
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恒星出没
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太阳方位角日变化规律
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直立杆影轨迹
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定日镜运动
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地平式日晷
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直立式日晷
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Gauss-Jordan 2x2 Elimination
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right triangle paradox
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SSA triangle: The Ambiguous Case
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Least Squares
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AQR Section 17: Mean but Sensitive
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AQR Section 17: Where's the Mean?
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Secant Slope Calculator
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Exponential or Logistic Function that…
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Growth of Facebook.com
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Lower and Upper Sum of a Function
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Pendulum Wave Machine (Simulation)
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Hilbert curve
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'Tangram' Puzzle 'Cat'
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Moss Egg by Robert Dixon
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Spirograph-Epitrochoid Earth and Moon
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Inclined Plane with Two Masses and a …
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The Relationship Between Human Height…
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Factorization - Visual illustration o…
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Kaleidoscope
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Rotating a Triangle Around a Coordina…
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