Seasons

সারসংক্ষেপ

Seasons are recurring annual changes in temperature and daylight caused mainly by Earth's axial tilt and revolution.

মূল ধারণা

ব্যবস্থাটি বুঝুন

Seasons are recurring annual changes in temperature and daylight caused mainly by Earth's axial tilt and revolution.

কেন ও কীভাবে ঘটে

কারণ ও প্রেক্ষাপট

Seasons occur because Earth's axis is tilted about 23.5° and maintains its orientation while Earth revolves around the Sun. The tilt changes both solar altitude and daylight duration, so each hemisphere receives different insolation through the year.

কীভাবে কাজ করে

First, Earth's tilted axis maintains near-parallel orientation during revolution. Next, the subsolar point migrates between the Tropic of Cancer and Tropic of Capricorn. Then solar altitude and day length change by latitude, producing solstices, equinoxes and opposite hemispheric seasons.

মূল তথ্য

• Equinoxes have nearly equal day and night globally.
• Solstices mark maximum seasonal solar declination: about 23.5°N or 23.5°S.
• The Northern and Southern Hemispheres have opposite seasons.

গুরুত্বপূর্ণ পরিভাষা

• solstice
• equinox
• solar declination
• insolation
• tropic

প্রতিষ্ঠিত তথ্য-উপাত্ত

• Solstices mark maximum seasonal solar declination: about 23.5°N or 23.5°S.

উদাহরণ ও কেস স্টাডি

• The June solstice brings the Sun overhead at the Tropic of Cancer.

কারণ ও উপাদান

• Earth's approximately 23.5° axial tilt.
• Earth's annual revolution around the Sun.
• The changing angle and duration of incoming solar radiation.

প্রভাব ও গুরুত্ব

• Solstices mark maximum solar declination and seasonal contrast.
• Equinoxes produce nearly equal day and night globally.
• Opposite seasons occur in opposite hemispheres.

ভূগোলের সাথে সংযোগ

The June solstice brings the Sun overhead at the Tropic of Cancer. This illustrates how seasons varies by location, scale or environmental context.

বাংলাদেশের সাথে সংযোগ

At about 23.5°N, the June solstice is especially relevant to Bangladesh's high summer solar altitude and monsoon context.

BCS প্রিলিমিনারির তথ্য

• Equinoxes have nearly equal day and night globally.
• Solstices mark maximum seasonal solar declination: about 23.5°N or 23.5°S.
• The Northern and Southern Hemispheres have opposite seasons.

BCS লিখিত বিশ্লেষণ

একটি বিশ্লেষণধর্মী উত্তর তৈরি করুন

• Show the cause-effect chain from axial tilt to changing insolation, temperature and day length.
• Contrast solstice and equinox conditions using the tropics and polar circles.
• Relate Bangladesh's pre-monsoon and monsoon seasonality to solar geometry without claiming tilt alone causes rainfall.

প্রচলিত ভুল ধারণা

• Seasons are not caused by changing Earth-Sun distance.
• The Equator does not have four temperate seasons like mid-latitudes.

দ্রুত রিভিশন

• Seasons
• Equinoxes have nearly equal day and night globally.
• Solstices mark maximum seasonal solar declination: about 23.5°N or 23.5°S.
• solstice / equinox
• Definition → process → spatial example