Transcript Season Vocabulary ppt

Season Vocabulary
• Seasons – A pattern of temperature changes &
other weather trends over a year.
Season Vocabulary
• Equator – Imaginary line which separates the
Northern from the Southern Hemisphere
• Earth rotates around an imaginary line
running through its center called an axis of
rotation.
• The ends of the axis are the north and south
poles.
• Earth turns/rotates on its axis once in 24
hours.
Season Vocabulary
• The side of the Earth in the sunlight is called
daytime.
• The side of the Earth in the darkness is
nighttime.
• Earth’s rotation is reason for day & night
• The Earth is tilted at about a 23 ½ degree
angle from its orbit around the Sun.
• Earth’s tilted axis and orbit cause seasons
Season Vocabulary
• A revolution is the motion of one object around
another once.
• It takes one year for Earth to make one revolution
around the Sun or 365 ¼ days.
• Leap year every 4 years – add up ¼ days
• Earth travels in an elliptical orbit around the sun.
It resembles an elongated oval-shape. Out of all
the planets, Earth’s orbit is the closest to a
perfect circle.
• Earth is the 3rd planet from the sun.
Season Vocabulary
• Solstice – Period of time when one hemisphere gets its
maximum area of sunlight, while the other hemisphere
gets its minimum amount; the time of year when days
are either longest or shortest and the angle of sunlight
reaches its maximum or minimum. Winter & Summer
– usually 21st of December and June
• Earth is closest to the sun in December but Northern
Hemisphere is tilted away – winter solstice – colder
temperatures/shorter days
• Earth is furthest from the sun in June but Northern
Hemisphere is tilted toward the sun – hotter
temps./longer days – summer solstice
Season Vocabulary
• Equinox – Period of time in an orbit in which
sunlight shines equally on the Northern
Hemisphere and the Southern Hemisphere; a
time of year when daylight and darkness are
nearly equal for most of the Earth. (Happens
twice a year). Spring & Fall or March &
September
• Equinox means literally – “equal night”
Season Vocabulary
• The seasons are the result of the tilt of the
axis of the Earth – Not the distance of the
Earth from the Sun!
Season Vocabulary
Together the tilt and
the angle of sunlight are
the reason for seasons!