And this annual event is called a heliacal rising.

这一年一度的事件被称为日升。

The heliacal rising was a fair indicator of when the Nile would flood.

螺旋上升是尼罗河何时泛滥的一合理指标。

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

这日历与期的农业教日历并存，后者依赖于天狼星的日升。

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

他们不断地调整它以适应天狼星的螺旋上升， 确保他们在他们的季节中永远不会偏离太远。

The next new moon, after the heliacal rising of Sirius, which happened in the last month of the calendar year, marked the New Year.

下一新月发生在日历年的最后一月天狼星的螺旋升起之后， 标志着新年。

And because the ancient Egyptians were using the lunar cycle in combination with this heliacal rising, some years ended up having 12 lunar months, while others had 13 lunar calender months, if Sirius didn't rise in the 12th month.

因为古埃及人将月球周期与这种日升相结合，如果天狼星没有在第 12 月升起， 一些年份最终有 12 阴历月， 而其他年份有 13 阴历月。

And because the ancient Egyptians were using the lunar cycle in combination with this heliacal rising, some years ended up having 12 lunar months, while others had 13 lunar calender months, if Sirius didn’t rise in the 12th month.

而且由于古埃及人将月球周期与这种日升相结合，如果天狼星没有在第 12 月升起，一些年份最终有 12 阴历月，而其他年份则有 13 阴历月。