Ramadan is a holy month awaited by Muslims around the world, especially Indonesia with a Muslim majority. In this holy month, Muslims fast for a full month, from sunrise to sunset; they don't eat or drink; they don't do bad deeds in order to get abundant rewards. In this holy month, Muslims not only fast, but also worship as much as possible to get blessings and rewards from Allah SWT. This year, the Indonesian government set the beginning of Ramadan on Monday, May 6, 2019. This determination is based on the Islamic Conference held by Ministry of Religious Affairs on Sunday (5/5) and attended by representatives of various Islamic organizations such as Nahdlatul Ulama –NU and Muhamadiyah and state representatives- friendly countries, especially neighboring countries where the majority of the population is Muslim. The determination of the beginning of fasting is usually done based on the position of the moon, considering the Islamic calendar is the lunar one. Thus, the National Aeronautics and Space Institute (LAPAN), as well as the Meteorology, Climatology and Geophysics Agency (BMKG) also involved in the Isbat trial. Fasting is not only holding back hunger and thirst but also holding back all lusts. In addition, during fasting, Muslims are also advised to practice other acts of worship such as giving alms, increasing friendship and avoiding acts that are prohibited by Islam. In fasting, every Muslim is commanded to leave behind various passions and worldly pleasures. By fasting, every Muslim can train himself or herself to be a patient person. When fasting, Muslims are trained to be able to withstand anger and not to think negatively other people. Welcome to Ramadan!