【題目】回答問題

(1)a、b、c、d 分別表示的節(jié)氣是 、 、 。

(2)當(dāng)太陽直射北回歸線時(shí),北極圈內(nèi)出現(xiàn) 現(xiàn)象,南極圈內(nèi)出現(xiàn) 現(xiàn)象,南溫帶內(nèi)的季節(jié)是 。

(3)我國(guó)國(guó)慶節(jié)時(shí),地球運(yùn)行在 之間,北半球白晝 (長(zhǎng)于、短于)夜晚。

【答案】

(1)秋分 夏至 冬至 春分

(2)極晝 極夜 冬季

(3)a c

【解析】

試題分析:

(1)當(dāng)?shù)厍蜻\(yùn)動(dòng)到a處時(shí),節(jié)氣是秋分,地球運(yùn)動(dòng)到b處時(shí),節(jié)氣是夏至,地球運(yùn)動(dòng)到c處時(shí),節(jié)氣是冬至,地球運(yùn)動(dòng)到d處時(shí),節(jié)氣是春分,故abcd節(jié)氣是秋分、夏至、冬至、春分。

(2)當(dāng)太陽直射北回歸線時(shí),北極圈出現(xiàn)極晝現(xiàn)象,南極圈出現(xiàn)極夜現(xiàn)象,北溫帶是夏季,南溫帶是冬季,故當(dāng)太陽直射北回歸線時(shí),北極圈出現(xiàn)極晝現(xiàn)象,南極圈出現(xiàn)極夜現(xiàn)象,南溫帶是冬季。

(3)當(dāng)?shù)厍蜻\(yùn)行到a處時(shí),時(shí)間在9月23日左右,運(yùn)行到b處時(shí),時(shí)間在6月22日左右,運(yùn)行到c處時(shí),時(shí)間在12月22日前后,運(yùn)行到d處時(shí),時(shí)間在3月21日前后,故我國(guó)國(guó)慶節(jié)時(shí)地球運(yùn)行到a和c之間,北半球白晝短于夜晚。

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