3月14日，可能只是一年中平平无奇的一天。但对热爱数学的人来说，是与圆周率(π, Pi) 近似值3.14相同的一天，被称为Pi day…
Category: Science in the Community (accessible)
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Last Solar Eclipse 2019
On 26 December, there was an annular eclipse occurred. However, people could only see the partial eclipse in Hong Kong. What is the partial eclipse? What is the difference between it and annular eclipse? How should we observe this kind of celestial events?