বাংলা | Epaper

বাংলা E-Paper 📍 Dhaka 📅 Wednesday | 23 September 2026, 8 Ashswin 1433 PID registration number 06

HEADLINE

● New OCs for Gulshan, Banani ● ADB approves $200m loan to Bangladesh ● Now launch fares hiked ● Dr Zubaida Rahman meets US First Lady Melania Trump ● Bus fares to rise 17 poisha per km; gazette issued ● PM, wife attend dinner hosted by Trump ● Death threat to Col Oli on Facebook, GD filed

Why day and night are almost equal on September 23

Published : Wednesday, 23 September, 2026 at 3:12 PM

Observer Online Report

Collected Photo

Day and night become nearly equal in duration across both hemispheres on September 23 as the Earth experiences its annual September equinox.

The September equinox occurred at 6:05 AM Dhaka time on Wednesday, marking a key milestone in Earth's orbital journey around the Sun. While termed "equal day and night," atmospheric refraction and standard sunrise-sunset timing conventions result in daylight lasting approximately 12 hours, 6 minutes, and 44 seconds in Dhaka.

Equinoxes occur twice a year, in March and September, when the Earth's 23.5-degree axial tilt positions the equator directly toward the Sun. This alignment ensures that sunlight is distributed almost evenly across the Northern and Southern Hemispheres, temporarily minimizing the duration gap between day and night.

The September event marks the onset of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. Atmospheric refraction bends sunlight, causing the Sun to appear above the horizon before it physically rises and after it sets, which slightly extends daylight beyond a strict 12-hour mark.

Following today's equinox, countries in the Northern Hemisphere—including Bangladesh—will experience progressively shorter days and longer nights. In Dhaka, daylight will decrease to 12 hours, 5 minutes, and 22 seconds on Thursday, continuing a gradual contraction until the winter solstice.

-SA

Also read

India seeks ‘positive, constructive’ ties with Bangladesh

Jamaat Amir slams govt over constitutional crisis and fuel prices

New OCs for Gulshan, Banani

Probe report against Shakib, 14 others deferred

Now launch fares hiked

Launch owners demands to raise fares by up to 60pc

Dr Zubaida Rahman meets US First Lady Melania Trump

Bus fares to rise 17 poisha per km; gazette issued

Editor : Iqbal Sobhan Chowdhury

Published by the Editor on behalf of the Observer Ltd. from Globe Printers, 24/A, New Eskaton Road, Ramna, Dhaka.
Editorial, News and Commercial Offices : Aziz Bhaban (2nd floor), 93, Motijheel C/A, Dhaka-1000.
Phone: PABX- 41053001-06; Advertisement: 41053012; 01793317829, 01550707291, E-mail: [email protected], ‍[email protected] Online: email: [email protected] 41053014; 01550707297 Advertisement: 01550707296

🔝