See the perfectly formed Altazimuth Pavilion for free at the Royal Observatory Greenwich.
This beautiful little building dates back to 1899. It is situated in the courtyard of the Peter Harrison Planetarium and houses an exhibition about the Sun on its ground floor, which is open daily and free to visit.
The pavilion’s unusual name comes from the name of the instruments it originally housed – these measured the altitude (position on the horizon) and azimuth (position east along the horizon) of celestial objects and ‘Altazimuth’ is a portmanteau of these two words.
The upper floor contains historic instruments including the Newbegin 6.25-inch Refractor and the Dallmeyer No.2 Photoheliograph. This floor is only open on certain dates.
Check What's On for details of the second floor opening.