It is false, due to precession of the equinoxes, but true enough to apply to short-term analysis.
orbit of the moon
1. Tilt of earths axis 2. Earths axis remains parallel throughout its yearly orbit.
The axis of Earth remains relatively fixed in space, pointing in the same direction in relation to the stars. It does not alter its parallel orientation. However, Earth's axial tilt does change slightly over long periods due to gravitational interactions with other celestial bodies.
In geography, "parallel" usually refers to lines of latitude that run parallel to the equator. These lines help in locating places on Earth's surface in relation to the equator. They are used to measure distances north or south of the equator.
No; it's about 23 degrees off the plane of its orbit.
The earths rotation about its axis has no affect on the orbit of satellites about earth. Only their relative velocities and positions are relevant, not their orientation
Its the orientation of the earths rotational axis that defines the equinox, the axis remains parallel throughout the orbit of the sun, and when its side on to the sun (spring and autumn), thats the equinox (equal length of day and night).
because of the earths axis
The earths rotational axis is tilted approx. 23 degrees from vertical The earths rotational axis remains parallel throughout its rotation around the sun, high summer (longest day) in the northern hemisphere, is when the top of the axis is at full tilt toward the sun. (shortest day in the southern hemisphere)
intersect
The earths rotational axis is tipped 23.5 degrees from vertical The earths rotational axis remains parallel throughout its orbit of the sun, so at one point in the yearly orbit the top half of the axis is at maximum tilt away from the sun, this is the winter solstice / shortest day (northern hemisphere) and summer solstice / longest day (southern hemisphere) Half a year later the positions are reversed as the axis remains parallel leaving the top of the axis tilting in.
y=-2.5 is parallel to the x axis. The equation of the x axis is y=0