Editing Launch window (section)

==Specific issues==
[[Space Shuttle]] missions to the [[International Space Station]] were restricted by [[beta angle]] cutout. Beta angle (<math>\beta</math>) is defined as the angle between the orbit plane and the vector from the Sun.<ref name="knk">{{cite web|url=http://www.tak2000.com/data/planets/earth.htm|title=  Earth's Thermal Environment|last=K&K Associates|year=2008|work=Thermal Environments JPL D-8160|publisher=K&K Associates|access-date=June 20, 2009}}</ref> Due to the relationship between an orbiting object's beta angle (in this case, the ISS) and the percent of its orbit that is spent in sunlight, solar power generation and thermal control are affected by that beta angle.<ref name="mcc">{{cite web|url=http://spaceflight.nasa.gov/feedback/expert/answer/mcc/sts-113/11_23_20_01_179.html|archive-url=https://web.archive.org/web/20030227111511/http://spaceflight.nasa.gov/feedback/expert/answer/MCC/sts-113/11_23_20_01_179.html|url-status=dead|archive-date=February 27, 2003|title=MCC Answers|author=Derek Hassman, NASA Flight Director|date=December 1, 2002|publisher=NASA|access-date=June 20, 2009}}</ref> Shuttle launches to the ISS were normally attempted only when the ISS was in an orbit with a beta angle of less than 60 degrees.<ref name="mcc"/>