Geologic Time Chart. The Earth's axis is tilted from perpendicular to the plane of the ecliptic by 23.45Â°. This tilting is what gives us the four seasons of the year-spring, summer, autumn (fall) and winter.Since the axis is tilted, different parts of the globe are oriented towards the Sun at different times of the year.eologic Time Chart. The Earth's axis is tilted from perpendicular to the plane of the ecliptic by 23.45Â°. This tilting is what gives us the four seasons of the year-spring, summer, autumn (fall) and winter.
Air Operations Area (AOA) means a portion of an airport, specified in the airport security program, in which security measures specified in Title 49 of the Code of Federal Regulations are carried out.ir Operations Area (AOA) means a portion of an airport, specified in the airport security program, in which security measures specified in Title 49 of the Code of Federal Regulations are carried out.
American Hospital Association (AHA), n.pr a nonprofit national organization of individuals, institutions, and organizations engaged in direct patient care. The association works to promote the improvement of health care services.