Day without a shadow is an event when the Sun is just above the equator. As a result, during the day the sun will be right above the head and result in no shadow.
*The National Aeronautics and Space Agency (LAPAN) note a day without a shadow, where the Sun is just above the equator on 21 March and 23 September 2018.
On both of these dates, the number of territories traversed by the equator will get this unique day ie the day of events without shadows.
Shadowless events occur because the Earth circulates around the Sun at a distance of 150 million kilometers with a period of about 365 days. The Earth's circular lines are somewhat oval so the Earth sometimes moves faster and sometimes moves more slowly.
Earth's circular plane is referred to as the ecliptic plane. This field is tilted at 23.4 degrees toward the earth's equatorial plane. Therefore, the Sun appears in the Northern Hemisphere for about half a year and is above the southern half of the world.
And for the territory of Indonesia Here is a schedule of days without shadow:
- Denpasar : 26 Februari dan 16 Oktober
- Jakarta : 5 Oktober dan 9 Oktober
- Belitung : 13 Maret dan 1 Oktober
- Pontianak : 21 Maret dan 23 September
- Sabang : 5 April dan 8 September