The Doctor's granddaughter Susan first describes her home world (not named as "Gallifrey" at the time) as having bright, silver-leafed trees and a burnt orange sky at night in the serial The Sensorites (1964). This casts an amber tint on anything outside the city, as seen in The Invasion of Time. However, Gallifrey's sky appears blue and Earth-like in "The Five Doctors" (1983) within the isolated Death Zone.
The Doctor's granddaughter Susan first describes her home world (not named as "Gallifrey" at the time) as having bright, silver-leafed trees and a burnt. orange sky at night in the serial The Sensorites (1964) This casts an amber tint on anything outside the city, as seen in The Invasion of T,ime. However Gallifrey's sky appears blue and Earth-like in "The Fi,ve Doctors" (1983) within the isolated Death Zone.