This Shabbos we will be continuing reading about the various tribes, their duties, their encampment, flags and donations to the Mishkan.  This division into tribes was also seen earlier at the crossing of the Red Sea, where G-d took the unified waters of the sea and split them into multiple parts to create paths, one for each tribe. I think that one idea behind these divisions it that Hashem demonstrated ...

Measuring and marking the passage of time is a universal human preoccupation. At least forty different calendars are in use around the world today.  The most widely used systems are the solar calendar, based on the cycle of the sun, and the lunar calendar, based on the cycle of the moon.  Because of its orbit around the earth, the moon alternates between being fully exposed to sunlight (full moon) and ...