Jakarta - BMKG has predicted that shadow-free days will occur in\nseveral regions of Indonesia in late February 2026. Where and when will\nthey happen?<\/p>\n
As quoted from the official BMKG website on Sunday (2\/15\/2026),\nshadow-free days will occur at different times across various regions in\nIndonesia. A shadow-free day, or primary culmination, occurs when the\nsun is directly above the observer\u2019s head, or at the zenith point.<\/p>\n
\u201cAs a result, the shadow of an upright object will appear to\n\u2018disappear\u2019 because it overlaps with the object itself. That is why the\nprimary culmination day is also known as a shadow-free day,\u201d BMKG\nsaid.<\/p>\n
BMKG explained that this condition occurs because the Earth\u2019s\nequatorial plane, or the plane of Earth\u2019s rotation, does not exactly\ncoincide with the ecliptic plane, or the plane of Earth\u2019s revolution. As\na result, the sun\u2019s position as seen from Earth appears to continuously\nchange throughout the year.<\/p>\n
\u201cThis year, the sun will be directly above Pontianak City on March\n20, 2026, at 11:50 AM WIB and September 23, 2026, at 11:35 AM WIB. On\nJune 21, 2026, at 3:25 PM WIB, the sun will be at the northern solstice,\nand on December 22, 2026, at 3:49 AM WIB, the sun will be at the\nsouthern solstice,\u201d BMKG said.<\/p>\n
BMKG said Indonesia\u2019s location near the equator means primary\nculmination in Indonesian territory occurs twice a year, not far from\nthe time the sun is at the equator. In other cities, primary culmination\noccurs when the sun\u2019s declination equals the city\u2019s latitude.<\/p>\n
\u201cIn general, the 2026 primary culmination in Indonesia occurs between\nFebruary 21, 2026, in Baa, East Nusa Tenggara, and April 5, 2026, in\nSabang, Aceh, and from September 7, 2026, in Sabang, Aceh, to October\n21, 2026, in Baa, East Nusa Tenggara,\u201d BMKG said.<\/p>\n
Here is the schedule of shadow-free days in various cities across\nIndonesia:<\/p>\n