Direction of the Earth's axis tilt in the x-y ecliptic plane?

Tomorrow is the spring equinox. This got me to thinking about
orientatoin of the Earth's axis with respect to its direction of travel
in its orbit around the Sun. Although the Earth's axis is tilted at 23
1/2 degrees in the ecliptic z-plane, what is the axis's orientation
with respect to the ecliptic x-y plane? Does it point:

a) in the direction of Earth's direction of revolution;
b) perpendicular to Earth's direction of revolution;
c) opposite Earth's direction of revolution; or,
d) some other angle?

I assume this changes over geologic time as the Earth wobble's around
it's center on a 28,000 year cycle.

What easily observed characteristics of the solar daily or yearly cycle
would indicate the direction of the tilt in the x-y ecliptic plane?

- Canopus56