New Year's Supermoon Comes With Caution In Goa The first supermoon of the new year 2018 on January 2 will be the biggest of the year. A supermoon is a lunar phenomenon that occurs when a full moon is at its closest point to earth. The first supermoon of the new year on January 2 will be the biggest of the year. A supermoon is a lunar phenomenon that occurs when a full moon is at its closest point to earth. This makes the moon appear up to 14 per cent larger and 30 per cent brighter than the micromoon, according to NASA, and is among the must-watch celestial events. The new year's celebration in Goa, however, comes with a touch of caution due to the Supermoon phenomenon on January 2. The tourism authorities in Goa have issued an advisory warning of unusual tidal activity and possible flooding of beaches on January 2 and January 31.The first supermoon of the new year on January 2 will be the biggest of the year. A supermoon is a lunar phenomenon that occurs when a full moon is