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October, Indonesia Experienced the Phenomenon of a Shadowless Day
from the BMKG (Meteorology, Climatology and Geophysics Agency) page, the phenomenon of a day without a shadow is a day where there is no shadow at all because the Sun is right at the highest position in the sky (the culmination). When the declination of the Sun is equal to the latitude of the observer, the phenomenon is called the ultimate culmination.
"At that time, the Sun will be directly above the head of the observer or at the zenith point. As a result, the image of an upright object will appear to "disappear" because it overlaps with the object itself. Therefore, the day when the main culmination occurs is also known as a shadowless day, ”wrote the BMKG.
A day without a shadow occurs because the Earth's equatorial plane / Earth's rotational plane does not coincide exactly with the ecliptic plane / Earth's revolutionary plane. Thus, the position of the Sun from Earth will appear to change continuously throughout the year between 23.5 ° N-23.5 ° S. This is called the daily apparent motion of the Sun.
"This year, the Sun is right at the equator on March 21, 2019 at 05.00 WIB and September 23, 2019 at 14.51 WIB. Meanwhile, on June 21, 2019 at 22.55 WIB, the Sun was at the turning point of the North (23.5 ° N) and on December 22, 2018 at 11.21 WIB, the Sun was at the South equinox (23.5 ° LS), "explained BMKG.
This phenomenon of a day without a shadow occurs throughout Indonesia. Seba, East Nusa Tenggara, is the last place to experience this phenomenon.