Have you ever noticed that at certain times of the year, daylight lasts much longer and it gets dark very late, while in other seasons the sky becomes dark much earlier? That is the seasonal phenomenon of long days and short nights \u2014 one of the clearest proofs that the Earth is tilted as it orbits the Sun.\u00a0 Let\u2019s explore this interesting secret with I-CLC!<\/span><\/p>\n V\u00ec sao ng\u00e0y l\u1ea1i d\u00e0i c\u00f2n \u0111\u00eam l\u1ea1i ng\u1eafn?<\/b> S\u1ef1 th\u1eadt l\u00e0 Tr\u00e1i \u0110\u1ea5t kh\u00f4ng \u0111\u1ee9ng th\u1eb3ng m\u00e0 nghi\u00eang 23,5\u00b0 so v\u1edbi qu\u1ef9 \u0111\u1ea1o c\u1ee7a m\u00ecnh. V\u00ec tr\u1ee5c nghi\u00eang n\u00e0y, c\u00f3 th\u1eddi \u0111i\u1ec3m m\u1ed9t b\u00e1n c\u1ea7u s\u1ebd nghi\u00eang v\u1ec1 ph\u00eda M\u1eb7t Tr\u1eddi v\u00e0 nh\u1eadn nhi\u1ec1u \u00e1nh s\u00e1ng h\u01a1n. Khi b\u00e1n c\u1ea7u B\u1eafc nghi\u00eang l\u1ea1i g\u1ea7n M\u1eb7t Tr\u1eddi, \u00e1nh n\u1eafng chi\u1ebfu l\u00e2u h\u01a1n, M\u1eb7t Tr\u1eddi m\u1ecdc s\u1edbm v\u00e0 l\u1eb7n mu\u1ed9n, t\u1ea1o ra hi\u1ec7n t\u01b0\u1ee3ng<\/span> ng\u00e0y d\u00e0i \u0111\u00eam ng\u1eafn m\u00e0 B\u00e9 th\u01b0\u1eddng th\u1ea5y v\u00e0o m\u00f9a h\u00e8.<\/span><\/p>\n The truth is that the Earth is not upright, it is tilted 23.5\u00b0 relative to its orbit. Because of this tilt, there are times when one hemisphere leans toward the Sun and receives more sunlight. When the Northern Hemisphere tilts closer to the Sun, sunlight lasts longer, the Sun rises earlier and sets later, creating the long-day, short-night phenomenon that you often see in summer.<\/span><\/p>\n Hi\u1ec7n t\u01b0\u1ee3ng di\u1ec5n ra \u1edf \u0111\u00e2u v\u00e0 khi n\u00e0o?<\/b> \u1ede b\u00e1n c\u1ea7u B\u1eafc (trong \u0111\u00f3 c\u00f3 Vi\u1ec7t Nam), hi\u1ec7n t\u01b0\u1ee3ng ng\u00e0y d\u00e0i \u0111\u00eam ng\u1eafn r\u00f5 nh\u1ea5t di\u1ec5n ra v\u00e0o m\u00f9a h\u00e8, \u0111\u1eb7c bi\u1ec7t l\u00e0 g\u1ea7n ng\u00e0y h\u1ea1 ch\u00ed (kho\u1ea3ng 21\/6). Trong khi \u0111\u00f3, b\u00e1n c\u1ea7u Nam l\u00fac n\u00e0y l\u1ea1i tr\u1ea3i qua ng\u00e0y ng\u1eafn \u0111\u00eam d\u00e0i v\u00ec nghi\u00eang ra xa M\u1eb7t Tr\u1eddi. Khi Tr\u00e1i \u0110\u1ea5t ti\u1ebfp t\u1ee5c quay, t\u00ecnh th\u1ebf \u0111\u1ea3o ng\u01b0\u1ee3c v\u00e0o m\u00f9a \u0111\u00f4ng.<\/span><\/p>\n Khi ng\u00e0y d\u00e0i h\u01a1n, \u0111i\u1ec1u g\u00ec x\u1ea3y ra?<\/b> Khi th\u1eddi gian ban ng\u00e0y k\u00e9o d\u00e0i, nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean v\u00ec M\u1eb7t Tr\u1eddi chi\u1ebfu s\u00e1ng l\u00e2u h\u01a1n. C\u00e2y c\u1ed1i h\u1ea5p th\u1ee5 nhi\u1ec1u \u00e1nh s\u00e1ng \u0111\u1ec3 ph\u00e1t tri\u1ec3n, c\u00f2n con ng\u01b0\u1eddi th\u00ec c\u00f3 th\u00eam th\u1eddi gian cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng ngo\u00e0i tr\u1eddi. \u0110\u00e2y c\u0169ng l\u00e0 kho\u1ea3ng th\u1eddi gian nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi nh\u1ea5t trong n\u0103m.<\/span><\/p>\n In the Northern Hemisphere (including Vietnam), the long-day, short-night phenomenon is most noticeable in summer, especially around the summer solstice (around June 21). Meanwhile, the Southern Hemisphere experiences shorter days and longer nights because it is tilted away from the Sun. As the Earth continues its orbit, the situation reverses during winter.<\/span><\/p>\n M\u1ed9t ch\u00fat th\u00fa v\u1ecb v\u1ec1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a Tr\u00e1i \u0110\u1ea5t<\/b> N\u1ebfu tr\u1ee5c Tr\u00e1i \u0110\u1ea5t kh\u00f4ng nghi\u00eang 23,5\u00b0, B\u00e9 s\u1ebd kh\u00f4ng bao gi\u1edd th\u1ea5y m\u00f9a h\u00e8, m\u00f9a \u0111\u00f4ng hay hi\u1ec7n t\u01b0\u1ee3ng ng\u00e0y d\u00e0i \u0111\u00eam ng\u1eafn n\u1eefa. M\u1ed7i ng\u00e0y s\u1ebd d\u00e0i g\u1ea7n nh\u01b0 b\u1eb1ng nhau su\u1ed1t c\u1ea3 n\u0103m \u2013 kh\u00e1 nh\u00e0m ch\u00e1n \u0111\u00fang kh\u00f4ng n\u00e0o?<\/span><\/p>\n If the Earth\u2019s axis were not tilted 23.5\u00b0, you would never see summer, winter, or the phenomenon of long days and short nights. Each day would be almost the same length throughout the entire year \u2014 pretty boring, right?<\/span><\/p>\n
\n<\/b>Why do days become longer and nights shorter?<\/b><\/p>\n![\"\"](\"https:\/\/i-clc.edu.vn\/wp-content\/uploads\/2025\/12\/4.png\")
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\n<\/b>Where and when does this phenomenon occur?<\/b><\/p>\n
\n<\/b>What\u2019s special when days get longer?<\/b><\/p>\n
\n<\/b>A fun fact about Earth\u2019s movement<\/b><\/p>\n