The angle that the Earth's axis is tilted is known as the axial tilt or obliquity. This tilt is approximately 23.5 degrees relative to the plane of Earth's orbit around the Sun. This axial tilt is responsible for the changing seasons as it affects the distribution of sunlight on the planet's surface throughout the year.
There is only one axis and it is always tilted. The part of the axis we call the 'north' pole is tilted toward the sun in the northern summer, and the 'south' pole is tilted toward the sun during the southern summer. That said, the earth itself is a little closer to the sun during the southern summer/northern winter.
Not only that, but it rises earlier, too. The Earth is a sphere, but the axis of rotation isn't perpendicular to the plane of our orbit around the Sun. And really, why should it be? The fact is that the Earth's spin axis is tilted at about 23.5 degrees from the perpendicular to the ecliptic ("Ecliptic" is the plane of the Earth's orbit around the Sun.) Since the Earth spins like a gyroscope, it's pretty stable; it doesn't wobble (much). So when the Earth's axis is tilted a little more toward the Sun, the days are longer and the nights are shorter. The Sun rises earlier and sets later. We call this "Spring" and "Summer". When the axis is tilted a little AWAY from the Sun, it's fall and winter; the Sun rises later and sets earlier, and we have shorter days and longer nights.
Spring, Summer, Autumn, Winter are the four seasons that are the result of the tilting of the earth as it orbits round the sun. Basically, the seasons are different, though in Britain, we sometimes wonder with our notoriously fickle weather.
Tilt combines with the earth's non-circular orbit to produce weather changes that can cycle as long as 125K years. That is why we are seeing polar ice loss in the north and polar ice growth in the south. The tilt also creates what we call a hole in the ozone layer. The tilt prevents the rays of the sun from hitting the ozone layer which causes the ozone to thin out.
when the south pole is pointed toward the sun, the northern hemisphere experiences winter, and the south hemisphere experiences summer. when the north pole is pointed toward the sun, the north hemisphere experiences summer, and the south experiences winter.
There is only one axis and it is always tilted. The part of the axis we call the 'north' pole is tilted toward the sun in the northern summer, and the 'south' pole is tilted toward the sun during the southern summer. That said, the earth itself is a little closer to the sun during the southern summer/northern winter.
Get a piece of filler wire and put half it's length inside the top of the pipe, call it the x-axis. Bend the outer half of the wire straight up to a 90 deg. angle, call it the y-axis. The angle measured from this y-axis to the face of the bevel is the bevel angle. Put another way, measure from the perpendicular line relative to the length of pipe, to the bevel. Industry standard is a 37.5 deg bevel. Now keep your bent filler wire handy and use as a gauge to check bevel angle. The angle of the wire is 90 deg minus the 37.5 deg = 52.5 deg.
parallel rectangle
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No ONE direction ALWAYS. The direction of the Earth's axis changes over the eons. The pattern that the axis draws on the celestial sphere is roughly circular (the precession) making one revolution about every 23000 years but there are small dips too (nutations) which complicate matters. Right now the axis points almost towards the star we call Polaris (it pointed closes sometime in 2007). in 11000 years it will point close to the star we now call Vega. Earth's axis of rotation is precessing, so that the direction in which the north pole points is tracing a circle in the sky. But that's happening so slowly that during the course of a person's lifetime, it appears to point permanently toward the same spot. That spot is presently very close to the star called Polaris ... the 'North Star'.
The 'tilt' of the Earth's axis doesn't change. The axis always makes an angle of about 661/2 degrees with the plane of the Earth's orbit, and the north pole is always pointed toward the same spot in the sky, near the star Polaris. But as we ride around the sun in the course of a year, since the axis always points toward the same place, that means that the north pole is tilted toward the sun during half of the trip, and away from the sun during the other half. And there are two moments during the year when the axis is neither toward nor away from the sun ... those are always around March 21 and September 22. If you're on the half of Earth that's tilted toward the sun, then you have Spring and Summer. And if you're on the half of Earth that's tilted away from the sun, then you have Fall and Winter. (It has nothing to do with being closer or farther from the sun. It's all on account of the tilt.)
Not only that, but it rises earlier, too. The Earth is a sphere, but the axis of rotation isn't perpendicular to the plane of our orbit around the Sun. And really, why should it be? The fact is that the Earth's spin axis is tilted at about 23.5 degrees from the perpendicular to the ecliptic ("Ecliptic" is the plane of the Earth's orbit around the Sun.) Since the Earth spins like a gyroscope, it's pretty stable; it doesn't wobble (much). So when the Earth's axis is tilted a little more toward the Sun, the days are longer and the nights are shorter. The Sun rises earlier and sets later. We call this "Spring" and "Summer". When the axis is tilted a little AWAY from the Sun, it's fall and winter; the Sun rises later and sets earlier, and we have shorter days and longer nights.
A straight angle
A right angle
Straight angle
A reflex angle.
An acute angle