Since every planet has some degree of tilt between its axis of rotation and its orbital plane, every planet has latitudes along which sunset is immediately after sunrise around the days of that planet's solstices.
In the broadest sense, that interval is generally referred to as "night".
In outer space, sunrise and sunset occur more frequently because the spacecraft is orbiting the Earth at a high speed, causing it to pass through sunrise and sunset multiple times a day as it circles the planet.
At the time of the June solstice, the time between sunrise and sunset at Ketchikan, Alaska is 17 hours and 28 minutes. On that day, sunrise is at 4:04 AM AKDT, and sunset is at 9:32 PM AKDT.
The sunset and sunrise times vary depending on the location. You can check specific sunrise and sunset times for a particular location in March 2009 using an online sunrise/sunset calculator or almanac.
When the clocks change back in fall to standard time, daylight hours decrease. This adjustment results in it getting dark earlier in the evening. By setting the clocks back an hour, sunrise and sunset times are aligned more closely with natural light cycles, leading to increased darkness in the evening.
The time between sunrise and sunset would be shortest on Mercury. This is because Mercury has a slow rotation period compared to its orbit around the sun, resulting in longer days and shorter intervals between sunrise and sunset.
The day with the shortest time between sunrise and sunset in the northern hemisphere is the day of the December solstice. In Texas' time zones, that falls between Dec. 20 and Dec. 22 inclusive.
Water-Skiing
There is no fixed answer to that, for a number of reasons. Every day has different sunrise and sunset times. It also depends on where on the planet you are. There are also different interpretations of when spring starts and ends.
The length of the shadow will be longest at sunrise and sunset, and shortest at noon when the sun is at its highest point in the sky. This is because the angle of the sun's rays hitting the object casting the shadow is more oblique at sunrise and sunset, creating a longer shadow.
All around white light must be displayed between sunset and sunrise.
At the north pole, there was no sunrise on that date. At the south pole, there was no sunset. Anywhere in between, the times of sunrise and sunset depended on the latitude of the location.
The shadow of the tree would be shortest at midday when the sun is directly overhead. This is because the angle of the sunlight is most perpendicular to the tree, resulting in a shorter shadow. At sunrise and sunset, the angle of the sunlight is lower, creating longer shadows.
Night is the period of time between sunset and sunrise.
The hours between sunrise and sunset.
That it's dark and that it occurs between sunset and sunrise.
"daylight" (hours)