Apparent Motion Of The Sun
Astronomy 100 -- Apparent Motility of the Sunday & Seasons
Annual PATH OF THE Lord's day ON THE Sky
===================================
Annual PATH OF THE Lord's day ON THE Sky
===================================
Earth Spin-Axis Tilt = 23.5°
Because of this tilt, the ANNUAL PATH of the Sun in the sky is NOT along the Celestial Equator. The Sun moves North and South of the C.E. The path of the Sun is known every bit the ECLIPTIC. Northernmost Betoken = 23.5° North of C.E. Southernmost Indicate = 23.5° South of C.Due east
Position of the Lord's day with respect to the CE occurs on specific dates. For historical reasons, calendars are adjusted such that these positions repeat every year at the same fourth dimension of year.
March 21 -- VERNAL EQUINOX Sun crosses the CE moving North.
June 21 -- SUMMER SOLSTICE
Sun is at FARTHEST Point NORTH of the CE.
Sept. 21 -- AUTUMNAL EQUINOX
Lord's day crosses the CE moving South
December. 21 -- Winter SOLSTICE
Sun is at FARTHEST Signal SOUTH of the CE.
Fix Figure 2-11
THE REASON FOR SEASONS
===========================
*** THE TILT OF THE EARTH = 23.5° ***
- Northernmost Betoken = 23.5° North of C.E.
Southernmost Indicate = 23.5° South of C.Due east
Position of the Lord's day with respect to the CE occurs on specific dates. For historical reasons, calendars are adjusted such that these positions repeat every year at the same fourth dimension of year.
- March 21 -- VERNAL EQUINOX
- Sun crosses the CE moving North.
June 21 -- SUMMER SOLSTICE
- Sun is at FARTHEST Point NORTH of the CE.
Sept. 21 -- AUTUMNAL EQUINOX
- Lord's day crosses the CE moving South
December. 21 -- Winter SOLSTICE
- Sun is at FARTHEST Signal SOUTH of the CE.
Fix Figure 2-11
THE REASON FOR SEASONS
===========================
*** THE TILT OF THE EARTH = 23.5° ***
Because of this tilt, the annual path of the Sunday in the sky is NOT along the Celestial Equator. The Lord's day moves in a higher place and below the C.East. This Annual Path of the Lord's day is known as the ECLIPTIC.
Fix Figure 2-11
Fix Figure 2-11
Sun'southward position changes above and beneath the Angelic Equator.
- Highest Point = 23.5° above C.E.
Lowest Point = 23.5° below C.Due east.
Distance of the Midday Sun
For any location on Earth,
- On March 21 -- Sun on CE (heading North)
- Altitude of Midday Sun = (90° - 32.8°) + 0° = 57.2°
On June 21 -- Sun 23.5° Above CE
- Distance of Midday Dominicus = (90° - 32.eight°) + 23.five° = 80.seven°
On September 21 -- Sun on CE (heading South)
- Distance of Midday Sun = (90° - 32.eight°) + 0° = 57.2°
On December 21 --Sunday 23.v° Below CE
- Distance of Midday Sun = (90° - 32.8°) - 23.five° = 33.7°
Change of Distance of Sun has 3 EFFECTS:
- The lower the Midday Altitude of the Sun, the more spread the sunlight.
- (Less sunlight hits each square meter of ground)
The Angle of the Sun's Rays
How to Heat a House - The lower the Midday Altitude of the Sun, the less time the Dominicus spends above the horizon.
- (Sunlight hours in a 24-hour interval are LESS)
Effigy shown in grade - Lower Midday Altitude of the Lord's day means more than energy is absorbed past the atmosphere. This keeps estrus from reaching the ground.
This is NOT a reason for seasons:
This statement is !
Soon, the Earth is closest to the Dominicus on Jan. iv, during our winter! If seasons depended on the distance to the Sunday, when we have summer, the residuum of the world should also. That is non the example. Instead, when we have summertime, the southern hemisphere has winter, and vice versa.
Lunar Phases and Motions
Dorsum to The Front Page.
Apparent Motion Of The Sun,
Source: https://spaces.imperial.edu/russell.lavery/astr100/lectures/ASTR100Topic02.html
Posted by: howardwalathever68.blogspot.com
0 Response to "Apparent Motion Of The Sun"
Post a Comment