# Around the world in less than one day?? **URL:** \ **Category:** Factual Questions\ **Created:** [January 28, 2000, 10:25pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648 "2000-01-28T22:25:00Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![SilentKnight](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@SilentKnight](https://boards.straightdope.com/u/SilentKnight)\ **Post date:** [January 28, 2000, 10:25pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/1 "2000-01-28T22:25:00Z")
My friend says that it is impossible to go around the world in less than one day. There are a few rules though. 1. You have to go around the equator. 2. You cannot be in space, you have to be within the earth’s atmosphere. I still think it is possible if you were to use the SR-71 Blackbird. Of course you would have to have a KC-135 ready to refuel me a couple of times. Please help me!!! ---
**Author:** ![BigRoryG](https://avatars.discourse-cdn.com/v4/letter/b/f07891/32.png) [@BigRoryG](https://boards.straightdope.com/u/BigRoryG)\ **Post date:** [January 28, 2000, 10:36pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/2 "2000-01-28T22:36:00Z")
Well, let’s do some rough math here, as we at the Stright Dope are so fond of. I believe the circumference of the Earth is something like 25000 miles. Divide that by 24 hours, and you get about a required average speed of just over 1000 MPH. since there are at least a couple of planes in the world that are capable of that kind of speed, with refueling and the like, even changing planes if the engine can’t last wouldn’t take too long. You’re friend is nuts. * * * “C’mon, it’s not even tomorrow yet…” - Rupert If you need a graphic solution, [http:\ alk.to\Piglet](http://talk.to%5CPiglet) ---
**Author:** ![Oblio](https://avatars.discourse-cdn.com/v4/letter/o/c4cdca/32.png) [@Oblio](https://boards.straightdope.com/u/Oblio)\ **Post date:** [January 28, 2000, 10:39pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/3 "2000-01-28T22:39:00Z")
A back of the synapse calculation shows that a bit over 1000 MPH should do the trick. Assuming that the logistical problems of refueling and airspace clearances can be taken care of. ---
**Author:** ![Oblio](https://avatars.discourse-cdn.com/v4/letter/o/c4cdca/32.png) [@Oblio](https://boards.straightdope.com/u/Oblio)\ **Post date:** [January 28, 2000, 10:40pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/4 "2000-01-28T22:40:00Z")
My first real simulpost. ---
**Author:** ![Boris\_B](https://avatars.discourse-cdn.com/v4/letter/b/fbc32d/32.png) [@Boris\_B](https://boards.straightdope.com/u/Boris_B)\ **Post date:** [January 28, 2000, 10:47pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/5 "2000-01-28T22:47:00Z")
[http://www.robinsonresearch.com/EARTH/at-a-glance.htm](http://www.robinsonresearch.com/EARTH/at-a-glance.htm) says > [@](#): > > Equatorial Circumference > (distance around the earth along the equator)–24,901.55 miles (40,075.16 kilometers). The Blackbird tops out at over Mach 3, but doing a quick-n-dirty estimate, I’d say it would average no more than Mach 3 since it has to slow down to refuel. The hypersonic KC-135 hasn’t been completed yet. (Or conceived of yet.) So let’s say the Blackbird has to go 25,000 miles above the earth’s surface (continuing the quick-n-dirty estimate thing). According to [http://www.allstar.fiu.edu/aerojava/mach.htm](http://www.allstar.fiu.edu/aerojava/mach.htm) , Mach 3 at 60,000 feet should be 2000 mph. So, in 24 hours, the Blackbird should travel 48,000 miles, a little less than twice around the world. So, if you leave some wiggle room to do all the equations I didn’t do (a real average speed considering all the slow-downs for refueling, a real circumference at 80,000 feet, the real speed of sound at 80,000 feet) you’ll still have the Bird travelling around the world once at the very least. Be sure you use a dual-control model. I wouldn’t want you falling asleep at the stick at Mach 3. * * * Any similarity in the above text to an English word or phrase is purely coincidental. ---
**Author:** ![DrFidelius](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/drfidelius/32/3447_2.png) [@DrFidelius](https://boards.straightdope.com/u/DrFidelius)\ **Post date:** [January 28, 2000, 10:48pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/6 "2000-01-28T22:48:00Z")
…and here I using Jeeves to try to find air speeds and cruising ranges for aircraft. Find something that can average just under Mach 1.5 for 24 hours and you’ve got it… ---
**Author:** ![SilentKnight](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@SilentKnight](https://boards.straightdope.com/u/SilentKnight)\ **Post date:** [January 29, 2000, 1:53pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/7 "2000-01-29T13:53:00Z")
Thanks everyone. ---
**Author:** ![handy](https://avatars.discourse-cdn.com/v4/letter/h/b5a626/32.png) [@handy](https://boards.straightdope.com/u/handy)\ **Post date:** [January 29, 2000, 3:58pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/8 "2000-01-29T15:58:00Z")
Don’t forget to figure in time zones!! If you do it right, you can gain yourself some real hours. ---
**Author:** ![Kilgore\_Trout\_1](https://avatars.discourse-cdn.com/v4/letter/k/6de8d8/32.png) [@Kilgore\_Trout\_1](https://boards.straightdope.com/u/Kilgore_Trout_1)\ **Post date:** [January 29, 2000, 7:20pm UTC](https://boards.straightdope.com/t/around-the-world-in-less-than-one-day/6648/9 "2000-01-29T19:20:00Z")
try to get ricky martin as a co-pilot. you’ll have no problems, then. * * * _what is essential is invisible to the eye -the fox_