The author's telescope is aimed into a siderostat
mirror for shooting the eclipse, which explains its unusual pointing angle.
A siderostat is a variation on the heliostat, a flat mirror that reflects sunlight in a constant direction as Earth rotates.
In the final design, the telescope's key moving element was a flat, 2-meter silvered glass mirror 27 centimeters thick in a fork-mounted siderostat.
The outgrowth of numerous discussions with other eclipse photographers, especially my colleague Roger Sinnott, and past experiences, it's a variant of a polar telescope fed by a siderostat.
I fashioned the siderostat around a polar drive scavenged from a broken German equatorial mount made by Carson Telescopes.
This pair of early A dwarfs, first noted at Narrabri (Hanbury Brown et al 1974) has now been resolved using the VINCI instrument and two of the VLTI siderostats
are simply movable flat mirrors that redirect light to a central location where beams from separate mirrors may be combined.