Saturday Morning Science:
Alka-Seltzer added to spherical water drop in microgravity onboard the International Space Station.(March
22, 2003) — Expedition Six NASA ISS Science Officer Don Pettit
performs a series of microgravity experiments with water spheres and
effervescent antacid tablets. In the second of four videos, Pettit
inserts a tablet into a 50-millimeter sphere and observes the fizzy
results.
An event worth celebration and, if in a mythical place like Stonehenge, worth to be photographed.
A solstice is an astronomical event that happens twice each year, when the tilt of the Earth’s axis is most inclined toward or away from the Sun, causing the Sun’s apparent position in the sky to reach its northernmost or southernmost extreme. The name is derived from the Latin sol (sun) and sistere (to stand still), because at the solstices, the Sun stands still in declination; that is, the apparent movement of the Sun’s path north or south comes to a stop before reversing direction.
The term solstice can also be used in a wider sense, as the date (day) when this occurs. The solstices, together with the equinoxes, are connected with the seasons. In some cultures they are considered to start or separate the seasons while in others they fall in the middle. The English expressions “midwinter” (winter solstice) and “midsummer” (summer solstice) may derive from a tradition according to which there were only two seasons: winter and summer.