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The Gateway to Astronaut Photography of Earth

(NASA Crew Earth Observations)

"We catch a glimpse of a huge swirl of clouds out the window over the middle of the Pacific Ocean, or the boot of Italy jutting down into the Mediterranean, or the brilliant blue coral reefs of the Caribbean strutting their beauty before the stars. And...we experienced those uniquely human qualities: awe, curiosity, wonder, joy, amazement." (Russell L. Schweickart, Apollo Astronaut ("The Home Planet")

Photographing the Earth from the International Space Station

Metadata: TILT field

Tilt is the calculated look angle away from a straight nadir (straight down below the spacecraft) view. If the tilt exceeds a certain angle, 55 degrees, then "HO" in the TILT field indicates that the look angle is very oblique and the horizon is probably visible. Although the field is now calculated from the spacecraft location data whenever it is available, it was input by hand for many years. When the cataloger looks at the image, they indicate that the horizon was visible, by entering "PAN-" at the beginning of the feature field. If "PAN-" is at the beginning of the feature field, then the tilt field is constrained to be "HO."