Serpens Cauda's boundaries lie between right ascensions of and and declinations of and . Points north of the celestial equator have positive declinations, while those south have negative declinations. Some of the names also occur in other declinations. These also have various combinations and case declinations. While the stars are fixed to their declinations the Sun is not. However, he was aware that declinations were not consistent with this model. The animation shows how global declinations have changed over the last few centuries. The declinations are slightly different depending on original syllable length. The visible declinations vary depending where you are on the globe.