Eclipse: have the same file open in two editors?

When I'm editing a large file, I often want to have it open in two editing windows at once (eg. for reference, or because I'm working on two different parts of the file at once).

Is there any way to do this with Eclipse?

Open your file and then Window->New Editor (Note: in newer versions it will be called New Window)

Then, click on its tab and drag it somewhere else to have two editors of the same file

Update: as mentioned by moschlar, From version 4.4, two editors can be created with Window -> Editor -> Clone.

In Eclipse Luna (4.4) and above, this is supported out of the box: Window -> Editor -> Clone.

I realize he specified a new editing window. Showing an alternative for those, like me, that do not want a new editor but would like to be able to look at the file in two places at the same time in the same tab.

Window -> Editor -> Toggle Split Editor will split the editor horizontally or vertically.
Ctrl + _ is horizontal and Ctrl + { is vertical. More precisely it's Ctrl + Shift + - and Ctrl + Shift + [.

I had issues with it in Mars (see note below) that seem to have cleared up in Neon.

Mars Note: The split editor seems a bit buggy. The JavaScript editor likes to jump the cursor to the other pane momentarily when it does a while-you-type-validation.