Credit & Copyright: Trudy E. Bell
Explanation:
Are photographs of star trails really evidence of the
Earth's rotation
about its axis?
Yes they are, and
science journalist Trudy E. Bell discovered that there is a
simple way to demonstrate this, if you have the stomach for it.
First, find a playground equipped with a standard
Merry-Go-Round (MGR)
located under or near a large, leafy tree.
Seat yourself near the middle of the MGR platform.
Ask a local playground expert (KID) to get you
spinning very, very fast.
As the scenery flashes by at a dizzying rate, point your camera
skyward and take a picture with a slow shutter speed setting.
The result will be similar to this excellent image of concentric,
arcing leaf trails centered at a point corresponding to the MGR's
axis of rotation - a convincing imitation of
circumpolar star trails recorded in
hours-long exposures
of planet Earth's night sky.
Then, just stand up and walk away ...
if you still can.
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Публикации с ключевыми словами:
star trail - следы звезд
Публикации со словами: star trail - следы звезд | |
См. также:
Все публикации на ту же тему >> | |
