June 5, 2009, 12:33pm. Someone else's is correct if you are referring to an item that belongs to someone else. E.g., This is someone else's blog entry.. The correct plural for passer-by is passers-by. This is because the word by is being used as an adjective modifying the noun passer. The noun is the word that is being pluralized.
It is the longest, sunniest day of the year. December 21 marks the day when the Earth is turned the farthest from the Sun. This is known as Winter Solstice. It is the shortest, darkest day of the year. The four seasons are spring, summer, fall and winter.
One year is the time taken for Earth to complete one orbit around the Sun relative to the stars, and is called a sidereal year. However, we measure a year to be the period between two successive spring equinoxes known as the Vernal Equinox and is on or about March 21, and this period is called a tropical year. The tropical year is about 20 minutes shorter than the sidereal year.