plane of the ecliptic
... that the plane of the ecliptic is the imaginary plane of the Earth as it orbits the Sun?
... that the <b id="mwDRA"><a class="mw-redirect" href="./Plane_of_the_ecliptic" id="mwDRE" rel="mw:WikiLink" title="Plane of the ecliptic">plane of the ecliptic</a></b> <i id="mwDRI">(effect pictured)</i> is the imaginary plane of the Earth as it orbits the Sun?