How do you define a direction in space?

Answer 1

Astronomers generally use either the equatorial or ecliptical reference frames. The standard reference plane for the equatorial reference frame is the earth's equator. The standard reference plane for the ecliptical reference frame is the plane of the earth's orbit around the Sun. The intersection of these two planes is a line that points in one direction towards the vernal equinox, and in the other direction towards the autumal equinox.

In both systems, the zero point of longitude (for ecliptic) or Right Ascension (for equatorial) is defined as the direction of the vernal equinox, also called the First point of Aries.

Answer 2

Use a reference point, and define north, or forward. From there you can define any direction you want.

Answer 3

with respect to your point of reference.... of course.

Answer 4

On an X-Y-Z axis, using stars for triangulation.

I assume once space travel becomes common, a government agency will define which stars would be used (for triangulation) in what sectors of the universe... probably not in my lifetime...

Answer 5

The only way you can is from a reference point. You can go towards a planet in space or away from an asteroid, or something along those lines. Other than that, it is impossible.

Answer 6

There is no n-e-w-or s in space (yeah no news either).

since space is not flat goes in every direction. It is only a matter of knowing where you want to go. Talk to your nearest alien taxi driver and say THAT WAY.

Answer 7

All Planets have a north and south pole.
In space there would be no east and west.
Therefore if you are in space looking at a planet,
you would see up or down. No east or west.

Answer 8

You could define it relative to your destination and which way you *think* it is... i.e. "Above and to the left of you."

OR somebody could create a compass attractor of sorts at the center of the Universe?... y'know, whichever is easiest.

Answer 9

Uh I have a theory.... there are insturments on board a rocket that are aliged with Earth's directions.

Answer 10

Galactic Coordinates

scienceworld.wolfram.com/astronomy/
cse.ssl.berkeley.edu/chips_epo/coordinates.html
www.infoplease.com/dictionary/galactic+coordinates
wikipedia.org/wiki/Galactic_plane