这个一年一度的活动被称为“偕日升”。

This annual event is called a heliacal rising.

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这个行政日历与早期依赖于天狼星偕日升的农业和宗教日历并存。

This administrative calendar existed alongside the earlier agricultural and religious calendar that depended on the heliacal rising of Sirius.

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他们不断地调整它以适应天狼星的偕日升，确保他们在自己的季节里不会偏离太远。

They continually adjusted it to the heliacal rising of Sirius, ensuring that they never got too far off in their seasons.

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