Ramadan will likely start on Saturday or Sunday as today is the 29th of Shaban (and it is either the 29 or 30 days in the Islamic Calendar, there is no 31). Below are some important things you should know:

If the moon is sighted today (as Muslims follow the Lunar Calendar and not the Solar calendar), then taraweeh (nafila) will start on Friday today In Shaa Allah.

UNDERSTANDING LUNAR AND SOLAR CALENDAR CONVENTIONS.

Lunar Calendars tracks time based on the movement of the moon every 29.5 days (from new moon to new moon) whilst solar calendars tracks their time based on the movement of the sun every 365 days, five hours, 48 minutes and 46 seconds.
Both of these calendars are correct.

Most places around the world use a solar calendar. However, Muslims and Jews follow a lunar calendar. Islamic calendars, otherwise known as Hijri calendars, are based on the lunar cycle, and its year consists of 12 lunar months. The Hijri calendar plays an important role for religious purposes and the Muslim religious festivals are based on this calendar.

A Jewish calendar uses primarily lunar definitions, and each month begins on the new moon, but the years are based on solar years. Chinese calendars are a type of lunisolar calendar, a combination of a lunar calendar and a solar calendar.

WHAT ARE THE SIGNS BY WHICH THE COUNT (of time) IS RECKONED WITH ALLAAH?

The answer is that they are the new moons because the number of months and years with Allaah is based on the new moons. Allaah says (interpretation of the meaning):

“It is He Who made the sun to be a shining glory and the moon to be a light (of beauty), and measured out stages for it; that ye might know the number of years and the count (of time)”

[Yoonus 10:5]

“They ask you (O Muhammad (peace and blessings of Allaah be upon him) about the new moons. Say: These are signs to mark fixed periods of time for mankind and for the pilgrimage”

[al-Baqarah 2:189]

Courtesy of Sierra Leone Islamic Web