This phenomenon is called a shadowy day or a day without a shadow, mentioning, Indonesia experienced this shadowy day happened twice this year
This event occurs because the Earth circulates around the Sun at a distance of 150 million kilometers with a period of about 365 days. the Earth's shoreline is somewhat tapering so that the Earth sometimes moves faster and sometimes moves more slowly.
The Earth's plane is called the ecliptic plane. This field is tilted at 23.4 degrees towards Earth's equatorial plane. therefore, the Sun appears over the northern hemisphere for about half a year and is above the southern half of the rest of the world.
"Changes in the visible position of the Sun cause changes in seasons on Earth, for example four seasons in the subtropics and also wet-dry season in the territory of Indonesia