The sun will be positioned directly overhead several towns and villages across Sri Lanka at approximately 12.10 noon today, September 1st, creating a remarkable astronomical event that locals can witness simply by stepping outside. The towns of Kalpitiya, Talawa, Sinharagama, Galkadawala, Nachchaduwa, Padikaramaduwa, Gomarankalla, and Verugal are among the specific locations where this solar phenomenon will be most precisely observed. This event is part of a broader period during which the sun tracks across Sri Lanka's latitudes, offering a fascinating natural spectacle for residents and astronomy enthusiasts alike.
What Is the Solar Overhead Phenomenon?
The solar overhead phenomenon, also known as "Lahaina Noon" in some parts of the world, occurs when the sun reaches its highest point in the sky and sits directly above a specific latitude on Earth. During this moment, vertical objects cast no shadow, or an extremely minimal one, as the sunlight falls perfectly perpendicular to the ground. This event is exclusive to locations situated between the Tropic of Cancer and the Tropic of Capricorn — a zone commonly referred to as the tropics — within which Sri Lanka comfortably falls.
Sri Lanka, being a tropical island nation located between approximately 5.9° and 9.8° North latitude, experiences the sun passing directly overhead twice a year. This happens once as the sun appears to move northward and once as it moves southward along its annual path across the sky. The current occurrence is part of the sun's apparent southward journey, which will see it crossing Sri Lanka's latitudes over a period of several days.
The Period of Solar Overhead Events Across Sri Lanka
According to astronomical data, the sun will be directly over the latitudes of Sri Lanka from August 28th to September 7th, 2024, due to its apparent southward relative motion. During this window, different towns and villages across the country will experience the overhead sun on different days, depending on their precise geographic latitude. The progression moves systematically from the northernmost points of the island toward the south as the days advance through this period.
Today, September 1st, the sun is positioned directly above the latitudes corresponding to Kalpitiya, Talawa, Sinharagama, Galkadawala, Nachchaduwa, Padikaramaduwa, Gomarankalla, and Verugal. Residents of these areas can observe the phenomenon at around 12.10 noon local time, which marks the moment of solar noon — the point at which the sun reaches its highest elevation in the sky for that particular day and location.
Why Does This Happen? Understanding the Sun's Apparent Motion
The sun does not actually move across Earth's latitudes. Rather, what we observe is a result of Earth's axial tilt of approximately 23.5 degrees and its orbital journey around the sun throughout the year. As Earth orbits the sun, the angle at which sunlight strikes different parts of the planet changes continuously. This creates the illusion of the sun moving northward and southward between the Tropic of Cancer (23.5° North) and the Tropic of Capricorn (23.5° South) over the course of a year.
During the June solstice, the sun is at its northernmost position over the Tropic of Cancer. It then begins its apparent southward journey, crossing the equator during the September equinox before reaching its southernmost point over the Tropic of Capricorn during the December solstice. Sri Lanka's latitudes are crossed during this southward journey in late August and early September, and again during the northward return journey typically in April.
How to Observe the Overhead Sun Safely
Residents of the affected towns are encouraged to observe this natural event safely. The simplest way to witness the phenomenon is to place a vertical stick or pole on flat ground and observe its shadow at precisely 12.10 noon. At the moment the sun is directly overhead, the shadow will virtually disappear or be reduced to a tiny circle directly beneath the object. A glass of water can also demonstrate the effect, as the sunlight will shine straight down into the water without casting a shadow on the sides.
It is critically important to never look directly at the sun with the naked eye, as doing so can cause serious and permanent eye damage. Certified solar viewing glasses or indirect observation methods should always be used when observing any solar event.
A Reminder of Sri Lanka's Tropical Location
This annual astronomical event serves as a vivid reminder of Sri Lanka's privileged position within the tropics. The overhead sun phenomenon is something that residents of temperate countries never experience, making it a uniquely tropical occurrence worth appreciating. As the sun continues its southward journey through September 7th, communities across different latitudes of Sri Lanka will each have their own moment in the spotlight — quite literally — as the sun passes directly above them at midday.
Residents of Kalpitiya, Talawa, Sinharagama, Galkadawala, Nachchaduwa, Padikaramaduwa, Gomarankalla, and Verugal are encouraged to take a moment today at 12.10 noon to step outside and experience this beautiful and scientifically significant celestial event firsthand.