Jewish Clock

Jewish Clock is a 24 hour clock which attempts to visualize the concepts of the clock that is used in Jewish law: Shaot Zmaniyot (or Zmanim).

The basic idea is that certain daily deadlines were defined as portions of the day. For example, according to Jewish law, the latest time one can pray the morning prayer, Shacharit, is when a third of the day passed, or in other words, 4 out of the 12 hours of the day have passed.

The modern way of using charts which translate the laws defined by Shaot Zmaniyot into our familiar clock, are not needed anymore when using this clock. Shacharit deadline is alway at 4. Shabbat, or any new day for that matter, always start at 12.

In particular, the clock divides the day, starting at sunrise, and ending at sunset, into 12 equal parts, which are each called one day hour. The night is divided in the same manner.

An important observation is that day lengths keep on changing, as do the lengths of the nights. In the summer the days are longer, and they leave much less for the night, and in the winter vice versa.

A non trivial way of showing the fact that we have more day time during the summer, is showing the time moving slower during summer days! the clock ticks the same number of times as usual: 60 seconds * 60 minutes * 12 hours a day. But those seconds are longer! So the clock ticks slower.

Location. Sunrise and sunset are strongly tied to ones location. That's why Jewish Clock needs to know the device's location before showing the time. In a device with no location capabilities, Jewish Clock can not function.

Enjoy,

Yehuda Adler

yehuda.adler@gmail.com

犹太时钟是一个24小时的时钟，试图想象犹太法律中使用的时钟的概念：Shaot Zmaniyot（或Zmanim）。

基本思想是某些每日截止日期被定义为当天的部分时间。例如，根据犹太法律，最新的时间可以祈祷早祷，Shacharit，是在一天中的三分之一过去，或者换句话说，在一天的12小时中有4个过去了。

使用此时钟时，不再需要使用图表将Shaot Zmaniyot定义的法则转换为我们熟悉的时钟的现代方法。 Shacharit的最后期限始终是4. Shabbat，或任何新的一天，总是从12开始。

特别是，时钟将日期从日出开始，到日落结束，分为12个相等的部分，每个部分称为一天时间。夜晚以同样的方式分开。

一个重要的观察是，日长不断变化，夜晚的长度也在变化。在夏天，日子越来越长，夜晚离开的时间要少得多，反之亦然。

一个非常重要的方式表明我们在夏天有更多的白天时间这一事实显示夏季时间变得更慢！时钟的刻度与往常相同：60秒* 60分钟*每天12小时。但那些秒钟更长！所以时钟的速度会变慢。

地点。日出和日落与一个地方紧密相连。这就是为什么犹太时钟需要在显示时间之前知道设备的位置。在没有定位功能的设备中，犹太时钟无法正常工作。

请享用，

耶胡达阿德勒

yehuda.adler@gmail.com