JAKARTA – The position of the sun that is right above the island of Java on October 11 will cause a day without shadows to appear in some areas. This can happen because the Earth's axis of rotation is tilted 66.6 degrees to the ecliptic.
This position makes the Sun not always above the equator (0° latitude) but at latitudes of 23.4° N (solar north) to 23.4° S (solitude).
A number of areas located between the two equinoxes can experience the phenomenon of the Sun over the island of Java. This phenomenon is said to occur twice a year. The phenomenon can be felt at midday.
"Java Island is located between latitudes 6°-8° South Latitude or south of the equator. So, the Sun will be above the island of Java a few days after the September Equinox and a few days before the Mare Equinox," said the Research Center for Space Science Research ( Pussainsa) Aviation and Space Research Organization (LAPAN) National Research and Innovation Agency (BRIN) Andi Pangerang.
Some areas that may experience a day without a shadow today, among others, in Bandung, Semarang, to Surabaya.
A shadowless day occurs when the sun is at its highest in the sky. This phenomenon occurs when the sun is directly above the observer's head or at the zenith point, which makes the image of an upright object appear to disappear because it overlaps with the object itself.
Andi Pangerang explained that to check the disappearance of shadows at midday when Shadowless Day appears, prepare upright objects such as sticks, poles, markers, bottles. Place the object on a flat surface. If not, you can use a pendulum in a state of equilibrium.
People who want to make observations are advised to calibrate the clock that will be used to mark time via https://jam.bmkg.go.id. Then observe the image produced by the object at the specified date and time
Andi said the phenomenon of the Sun directly above the island of Java will occur during this week until October 14. "During this week, from October 8 to October 14, the Sun is above the island of Java," Andi said in a written statement.
List of Sun Regions Over Java Island in a Week
Furthermore, the so-called shadowless day phenomenon can only be observed when the weather is clear. It is estimated that the weather in Bandung at the time of the phenomenon is cloudy.
"This phenomenon is not observed if the weather is cloudy or rainy," said Head of the Bandung Meteorology, Climatology and Geophysics Agency (BMKG), Teguh Rahayu in a written statement, Sunday, October 10.
The phenomenon of a day without a shadow is said to not apply when clouds cover the sun which causes the Earth's surface area to tend to decrease, although hot air can still be felt due to reduced humidity.
In addition to these areas, the phenomenon of a day without a shadow will also occur in Bandung. Rahayu said the shadowless day that would occur on Monday 11 October would be short of about 2 to 3 minutes.
"For the Bandung area, a culmination will occur on October 11, at 11:36:19 WIB," said Rahayu.
Impact of Shadowless Day
Then the phenomenon of a day without a shadow is said to have no impact on the weather or climate, but is an optically related phenomenon between sunlight and objects on the earth's surface.
The public is advised not to panic. Then the public is also advised to condition the body so that it is always well hydrated, and to use protective equipment such as sunscreen, umbrellas, hats or other protective equipment.
List of Areas that Experience Shadowless Day October 11
The shadowless day phenomenon will occur quite briefly at certain hours for each region. The following is a list of regions with a shadowless day phenomenon on Monday (11/10).
Pelabuhan Ratu : Monday, October 11, 2021 at 11.40.32 WIB
Sukabumi : Monday, October 11, 2021 at 11.39.02 WIB
Semarang : Monday, October 11, 2021 at 11.25.07 WIB
Purwodadi : Monday, October 11, 2021 at 11.23.05 WIB
Lasem : Monday, October 11, 2021 at 11.21.12 WIB
Bojonegoro : Monday, October 11, 2021 at 11.19.13 WIB
Lamongan : Monday, October 11, 2021 at 11.17.05 WIB
Surabaya : Monday, October 11, 2021 at 11.15.44 WIB
Sampang : Monday, October 11, 2021 at 11.13.48 WIB
Sumenep : Monday, October 11, 2021 at 11.11.18 WIB
Kep. Miss: Monday, October 11, 2021 at 11.04.45 WIB
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