This sky map shows the radiant of the Perseid meteor shower from the constellation Perseus in the northeastern sky during the meteor display's peak on Aug. 12 and 13, 2015. The Perseids appear to radiate out from a point on the border of conste.
The best thing to do if you plan on being in the heat is to hydrate in the morning with 1 teaspoon of pure sea salt in a bottle of water to begin your day. Maintain a constant intake of water throughout your day. For those doing Ramadan, please make it a priority to drink water in the morning before sunrise.
You say either Happy Ramadan or Ramadan Mubarak. You can say it any time during the month of Ramadan. You can wish them good luck with the fast if you want to. You should wait until Ramadan is over, and during the Eid holiday congratulate them on successfully completing their fasting.