the same kind of glass they use for large glasss insulations in city's as when they pour the hot reflective metal normal glass would shatter this glass is known as fermats glass as this was the name if the inventor. There is another kind of glass where they use standard glass but user forgers glue to attach the glass over the metal when the drying process is complete
lines of latitude
latitude?
Each 'meridian' is a line of constant longitude.
Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
Latitude.
Latitude and longitude
The lines that intercept latitude lines are lines of longitude.
Longitude lines go vertically and latitude lines go horizontally.
Every parallel of latitude crosses every meridian of longitude.
Lines of latitude and longitude allows any position on the Earth to be plotted.
Lines of Longitude
Lines of latitude and lines of longitude are equally misunderstood by substantial and virtually equal fractions of the general population.