https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-atmospheric-refraction/v/why-do-stars-twinkle-but-planets-dont 2020-06-23T07:22:42Z Why do stars twinkle (but planets don't)? Let's explore what causes the twinkling effect of stars. We will also explore why planets, sun and moon don't seem to twinkle.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/of79dhOwowz6rpXpDBKHOUccBKjHSC2Wo9zGQnaD2LjYVqDtJxh5wDt-p9Pe72VuBq39Urkls9WvO8buo8KNbZjz Why do stars twinkle (but planets don't)? Let's explore what causes the twinkling effect of stars. We will also explore why planets, sun and moon don't seem to twinkle.  https://cdn.kastatic.org/ka-youtube-converted/73c_0ZAqSU0.mp4/73c_0ZAqSU0.mp4 462 Atmospheric refraction https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-atmospheric-refraction/v/advanced-sunrise-delayed-sunset 2020-06-23T07:22:42Z Advanced sunrise & delayed sunset Why is the sun squashed during sunrise and sunset? Why do we see the sun even before it rises? Our atmosphere is the main cause of this. We will explore these questions in detail.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/gziVHbCGiY9i63QyT5YxMnibSWbi_uZJAlgYuhuAmz5SXFEq06AnOAVyBrtFVJHWESyJwl3W1XIa-OuK5UjqytE9MQ Advanced sunrise & delayed sunset Why is the sun squashed during sunrise and sunset? Why do we see the sun even before it rises? Our atmosphere is the main cause of this. We will explore these questions in detail.  https://cdn.kastatic.org/ka-youtube-converted/7kAzunSPfpg.mp4/7kAzunSPfpg.mp4 544 Atmospheric refraction