The various functions from the expression language
listed in Section 10.7 are available directly from JyStilts.
Each of the subsections in that section is a class in the stilts
module namespace, with unbound functions representing the functions.
This means you can use them like this:
>>> import stilts
>>> print stilts.Times.mjdToIso(54292)
2007-07-11T00:00:00
or like this:
>>> from stilts import CoordsDegrees
>>> dist = CoordsDegrees.skyDistanceDegrees(ra1, dec1, ra2, dec2)