Hi Anselmo et al, You're right - in English "slope" and "inclination" both refer to the angle to the horizontal. This applies both to general usage and the specialist gnomonic usage (as defined by the BSS Sundial Glossary at www.sundialsoc.org.uk)
However, whilst the inclination is usually given as an angle, the slope is often a ratio, i.e. 1 in 100. The complimentary angle in gnomonic terms is the reclining angle, measured from the vertical. My preference is not to use this, though, and to stick to the inclination. It's nice to learn something of the origins of our strange language! Regards, John Davis N52d 05m, E1d 08m. -
