如图,阴影为夜半球,A点为晨昏线纬度的最高点,AC位于同一经线上

如图,阴影为夜半球,A点为晨昏线纬度的最高点,AC位于同一经线上,BC位于赤道,DBC的中点。完成2627题。

26. 若不考虑地表差异,下列说法正确的是

A. 此日全球昼夜等长    

B. BC段弧长为赤道周长的四分之一

C. AC段经线上各点的昼长在此日达一年中最小值

D. ABC三点间球面距离相等

27. 此时刻,D点的地方时为

A. 800       B. 830       C. 9 00        D930

答案

BC

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