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 amount of daylight gained each day varies depending on the time of year and location. On average, the amount of daylight gained can range from 2 to 5 minutes per day during spring and fall, while it can be as much as 7 to 8 minutes per day around the summer solstice in some locations.
Every Day the Earth gains more time. It is only about three minutes that are gained each day, after the winter solstice.
No matter where you are on the planet - the day lengthens by four minutes each day, after the winter equinox, up to the summer solstice.
The amount of daylight gained varies depending on your location and the time of year. Generally, around the time of the spring equinox, many places in the Northern Hemisphere can gain approximately 2 to 3 minutes of daylight each day as the days lengthen. This increase continues until the summer solstice, after which daylight begins to decrease again. For specific details, it's best to check local sunrise and sunset times.
After the winter solstice, the amount of daylight gradually increases each day. The increase in daylight varies depending on your location, but on average, you can expect to gain about 2-3 minutes of daylight each day after the winter solstice.
After the winter solstice, the amount of daylight added each day gradually increases. Initially, only a few seconds are added, but as we approach the spring equinox, the days get longer more quickly. By the time of the summer solstice, the amount of daylight added each day starts to decrease again.
The number of seconds or minutes gained per day is different for every date, and for every latitude. It runs in a sinusoidal curve; starting from a trough on December 21, the day length begins to CREEP up slowly, day by day, a few seconds, then many seconds, then an additional minute each day. By March 21, the equinox, the Alberta BC days are getting rapidly longer; 4 minutes each day! Then the pace of increase slows, until mid June when the days are getting only seconds longer each day until June 21, when the cycle peaks and begins to fall.
The amount of daylight gained or lost each day is not consistent due to the tilt of the Earth's axis and its elliptical orbit around the sun. This causes variations in the angle at which sunlight reaches different parts of the Earth throughout the year, leading to changes in the length of daylight hours.
Days never get shorter, they are always the same length. We do, however, lose a few minutes of daylight each day from June 21 to December 21. It's hard to say exactly how many minutes because it depends on one's latitude. Somewhere around 3-4 minutes for those of us in the continental US, I'd guess.
In New Jersey, after the winter solstice, you gain approximately 2-3 minutes of daylight each day as the days gradually get longer heading towards spring.
Daylight increase is not a linear function. It is very low at each solstice and equinox, slowly increases to mid term and then decreases again. Latitude also needs to be taken into account.
Daylight increase is not a linear function. It is very low at each solstice and equinox, slowly increases to mid term and then decreases again. Latitude also needs to be taken into account.