Thursday, March 30, 2017

halacha - How do I calculate the latest time to start the third Shabbos meal on erev Yom Tov?


From myzemanim.com for where I live, for this Shabbos, erev Shovuos, the “sho’o zemanis” (Proportional Hour) Gra & Baal Tanya is 1hr:22mins. Nightfall - 3 Stars is around 10:30 pm. Shkia is around 9:20 pm.


How do I calculate the latest time to start Sholosh seudas “sho’o asiris”?



Are there any leniencies bearing in mind the length of the sho’o zemanis?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...