In today’s day and age when it is acceptable to wear a Yarmulka ( Kippah) everywhere, the Poskim prohibit a Jewish male from even walking 4 Amos (approximately 8 feet) without a head covering. The Mishna Berura maintains that even while sitting in one place, a head covering is required. (However, while sitting and not saying any Devorim SheBikedusha, it will suffice to cover your head with your hand)
Halachos for Shabbos Kodesh:
1) When davening Shemona Esrei, Jewish males should wear a hat on top of their Yarmulka. During Shacharis, married men should cover their heads with their Tallis. This extra covering of the head during davening humbles a person and increases his fear of Hashem.
The Mishna Berura maintains that one’s head should be covered with his Tallis [during shachris] for the entire length of davening.
Single men who have the minhag to wear a Tallis (prevalent minhag in Sephardic and German communities) should nevertheless not cover their heads with their Tallis, and should wear a hat instead.
2) People whose custom it is not to wear hats ever (even when visiting dignitaries, weddings etc.) may be exempt from this extra hat requirement during Tefilah. Your rabbi should be consulted to determine your personal obligations in this matter.
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WISHING YOU A WONDERFUL AND FULFILLING SHABBOS.
PLEASE TRY AND PRINT OUT THE HALACHOS FROM THE PAST WEEK AND REVIEW WITH YOUR FAMILY AT THE SHABBOS TABLE.
ALSO, IF YOU CAN PRINT OUT A COPY OR TWO OF THE HALACHOS OF PAST WEEK, AND PLACE IN YOUR SHUL, IT WOULD HELP SPREAD THE WORD OF HASHEM TO MANY MORE PEOPLE! TIZ 
Important Numbers
