> About how long does it take for the Earth to rotate half a turn on its axis?And the answer: 12 hours.It takes a day, or about 24 hours, for the Earth to complete one rotation on itsaxis. So it takes half that time – 12 hours – for the planet to rotate halfway.Photo credit: Maulor[https://commons.wikimedia.org/w/index.php?title=User:Maulor&action=edit&redlink=1].The Earth is constantly rotating on its axis. The invisible line which runsfrom the South to North Pole defines which areas of the Earth receive sunlightat which times – thus, time zones. However, did you know that not every place onEarth rotates at the same speed? The regions closest to the equator have thehighest rotational speed (explaining why they launch so many rockets fromFlorida), while those farthest away from the equator rotate the slowest. Additionally, the tilt of the Earth's axis is the reason for the phenomenoncalled Midnight Sun in Nordic countries (which means exactly what it's namedfor: nearly 24 hours of sun), as well as the complete lack of sunlight in wintermonths. At a tilt of 23.5 degrees, the ability for sunlight to reach farnorthern or southern regions highly depends the month of the year – AKA theposition of the Earth relative to the sun. This means that in the north'ssummer, the northern hemisphere is tilted towards the sun, while in the winter,the northern hemisphere is tilted away from the sun.But why can't we feel the Earth rotate under us every day? Well, the shortanswer is that we're moving too. Even though the Earth is hurtling around itsaxis (and around the sun at the same time), there are no changes to its speed.Thanks to gravity and centrifugal force – which refers to the outward force on amass when it is rotated – we stay grounded on our planet and cannot experienceits spin. Learn more about Earth's rotation from Neil deGrasse Tyson here[https://www.youtube.com/watch?v=p9MAtyWEjZY&t=152s].