Saki時間からCeres時間への変換
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+2
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+1.5
+1
+0.5
+0
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-1
-1
-1
-1
-2
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-2
-2
-2
-2
-3
-3
-3
-6
-6
-6
-6
-7
-7
-8
-8
-9
-10