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A bright Nova in Centaurus was discovered on Dec 2, 2013 at magnitude V=5.5.Its luminosity reached mv=3.8 from Dec 5 to 7, becoming the brightest Nova of2013 and of the last decades. On Dec 14 it brightened at mv=3.2. Theobservations of the author contributed to the compilation of the IAU Circular9265 which announced the Nova as V1369 Cen and are here described. The firstobservations have been made with naked eye, and the use of same altitudecalibration stars of similar color allowed an accuracy within 0.1 magnitudes.The method of selecting stars on the same almucantarat (altitude circle) evenfarther than 20 degrees, reduces the effects of differential atmosphericextinction. Its application is useful not only for bright Novae but also forluminous variable stars like the supergiant Betelgeuse and Antares and somebright Miras.

Nova Centauri 2013 broad maximum from visual observations calibrated with same altitude stars