Although the seasonal equinoxes and solstices seem to divide the year into four equal parts, when you count the days of what we officially call winter, spring, summer and fall, each season is different, says Bing Quock, acting chairman of the Morrison Planetarium at the California Academy of Sciences.

NPR: Not All Seasons Are Created Equal

Notably, every 18.6 years, during the northern lunar standstill, the moonrise is aligned with the sites two rock pinnacles, as well as during the summer and winter solstices, and the fall and spring equinoxes.

WHITEHOUSE: The White House

Brands are no longer so carefully crafted, calculated and canned that we must plan in the fall, produce in the winter, launch in the spring, and maintain in the summer.

FORBES: Bodyform Paves The Way For 'Brand Improv'

Just as sure as there is summer, there will be fall and eventually winter, which will be relieved by spring.

FORBES: Getting Happy, Gaining Momentum & Flourishing

It would offer creative leasing, letting you drive a Chevy Corvette during the summer, a Cadillac Seville STS during the fall and spring and a GMC Yukon during the winter.

FORBES: Digital rules