The length of daylight, the amount it changes from day to day, and whether it gets
longer or shorter every day, depend on the time of year and your location on the
Earth. They're different in every season and at every latitude, so there's no general
description that's true for all places and times.
Yes, the sun's position in the sky affects the length of daylight. The angle at which the sun's rays hit the Earth's surface changes throughout the day due to the Earth's rotation, which in turn affects the length of daylight hours.
The tilt of Earth's axis as it orbits the sun is what causes changes in temperature and the length of days. During different times of the year, different parts of the Earth receive varying amounts of sunlight, leading to seasonal temperature fluctuations and changes in the length of daylight hours.
Everywhere: the length of the day is always 24 hours irrespective of latitude & longitude since the angular rotation of the planet is 360º per 24hours. The DAYLIGHT length changes seasonally and proportionally to latitude, but the DAY length is constant.
In terms of the amount of minutes of daylight, that changes every day, so it certainly does change in a week. Days still have 24 hours though, except when the hour goes forward and back.
Daylight starts and ends with the centre of the Sun theoretically at a zenith distance of 90 degrees 50 minutes. It is more than 90 degrees to allow for atmospheric refraction and also because the top edge of the visible Sun must be level with the horizon. The length of daylight depends on the Sun's declination and the observer's latitude. When these two factors are equal the Sun passes overhead at midday.
Yes, the sun's position in the sky affects the length of daylight. The angle at which the sun's rays hit the Earth's surface changes throughout the day due to the Earth's rotation, which in turn affects the length of daylight hours.
Today September 24th average is 12 hours and 03 minutes.
At Massena, it goes from 15 hours, 37 minutes to 8 hours, 46 minutes.
The pattern of light and dark follows a classic "sine" wave. At the Solstices, the amount of daylight hardly changes at all from a week before the solstice to the day of the solstice, and it begins to swing (slowly!) in the week following the solstice. Around the Equinoxes, and depending on your latitude, the change in the duration of daylight can vary by several minutes from one day to the next. If you want precise numbers for your latitude, go to the U.S. Naval Observatory's web site and calculate the sunrise/sunset table for an entire year at your location. See the link below.
At 41 degrees north latitude, you gain some length of daylight every day from December 21 until June 21, and you lose some length of daylight every day from June 21 until December 21. The number of minutes difference from one day to the next also changes. It's greatest on March 21 and on September 21, and when you get to June 21 or December 21, it's almost nothing.
At Massena, it goes from 15 hours, 37 minutes to 8 hours, 46 minutes.
No, they are not constant at all. The duration of sunlight varies in a sinusoidal pattern, with the amplitude of the pattern set by your latitude. The change in daylight also increases and decreases, depending on your date and your latitude. Look at the link below to the US Naval Observatory's web site to times of sunrise and sunset for an entire year. Enter your location, and it will calculate the times of sunrise and sunset for a complete year. You can see that near the solstices, the day length changes by less than a minute over the course of a week, while near the equinoxes, it changes by several minutes each day!
The tilt of Earth's axis as it orbits the sun is what causes changes in temperature and the length of days. During different times of the year, different parts of the Earth receive varying amounts of sunlight, leading to seasonal temperature fluctuations and changes in the length of daylight hours.
The Length of Daylight in Kansas City on June 21st in 14 Hours
At the equator, during the equinox, the length of daylight is approximately 12 hours. At the poles, during the equinox, there is no daylight as it is the period when the sun remains below the horizon for a full 24 hours.
Everywhere: the length of the day is always 24 hours irrespective of latitude & longitude since the angular rotation of the planet is 360º per 24hours. The DAYLIGHT length changes seasonally and proportionally to latitude, but the DAY length is constant.
Two weeks