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We don't celebrate Rosh Chodesh Tishrei on the first day of. Instead, we celebrate Rosh Hashana.

When the 9th of Av falls on Shabbat and the Tish’a B’Av fast is postponed to the 10th, the calendar event now says “Tish’a B’Av (observed)”.

Fast start and end times are now provided for major fast (Tish’a B’Av) and minor fasts (Ta’anit Esther, Tzom Gedaliah, Tzom Tammuz, Asara B’Tevet, & Ta’anit Bechorot). Minor fasts begin at alot hashachar (when the sun is 16.1° below the horizon in the morning) and end when 3 medium-sized stars are observable in the night sky (when the sun is 7.083° below the horizon in the evening). Tish’a B’Av fast begins at sundown and ends when 3 medium-sized stars are observable.

Fast start and end times are now provided for major fast (Tish’a B’Av) and minor fasts (Ta’anit Esther, Tzom Gedaliah, Tzom Tammuz, Asara B’Tevet, & Ta’anit Bechorot). Minor fasts begin at alot hashachar (when the sun is 16.1° below the horizon in the morning) and end when 3 medium-sized stars are observable in the night sky (when the sun is 7.083° below the horizon in the evening). Tish’a B’Av fast begins at sundown and ends when 3 medium-sized stars are observable.