| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 87.1 | | SERF::POWERS | | Tue Jul 23 1985 15:23 | 9 |
| Shall I try a late guess?
iso- (prefix meaning "equal")
-gon (suffix meaning "angle")
hence "isogonic" meaning equi-angular?
Seems a fair connection with cartography.
- tom]
|
| 87.3 | As Isogon has "iso" sides ;-) | INK::KALLIS | Support Hallowe'en | Fri Nov 14 1986 08:38 | 6 |
| Re .2:
It's called the "agonic line," if it's the one where
the needle always points North...
Steve Kallis, jr.
|
| 87.4 | According to Uncle Sam... | APTECH::RSTONE | | Fri Nov 14 1986 09:57 | 15 |
| Re: .2 & .3
All aircraft and marine navigational charts published by the U.S.
Department of Commerce depict and label lines along which there is
a constant variation between magnetic and geographic true north.
The legend on these charts refer to these as _isogonic lines_ of
magnetic variation. This information is critical for navigation over
any signicant distance.
As an example, in the New England area, the magnetic variation changes
by 1 degree for each 60-80 statute miles of east-west travel. All
aircraft course and heading information is specified relative to
magnetic north, yet most aircraft rely primarily upon a gyro-compass
during flight. Hence, the gyro must be periodically reset to adapt
to the changing magnetic variations.
|
| 87.5 | | REGENT::EPSTEIN | Bruce Epstein, Hardcopy Firmware | Fri Nov 14 1986 12:57 | 3 |
| re: .3, "agonic lines"
Aren't they U.S. Air now?
|