- #1

mun

- 10

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Is "orbital velocity" supposed to be the same as "rotational velocity"? it seems that a "rotation curve" is supposed to plot the rotational velocity of a star, but then some articles e.g. http://en.wikipedia.org/wiki/Galaxy_rotation_problem claim "orbital speed" is plotted.

The equation for rotational velocity seems to be in the shape of V sin(i) but the equation for orbital velocity doesn't depend on sin.

Any help will be much appreciated.

Thanks!