( ( The ( Gregorian Calendar ) ) ( ( ( ( is solar-based ) ( , ( relying ( on ( the fact ) ) ) ) ) ( that ( ( ( ( every year ) , ) ( the earth ) ) ( ( completes ( ( one revolution ) ( around ( the sun ) ) ) ) ( after ( 365.25 days ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Gregorian) (NNP Calendar)) (VP (VBZ is) (ADJP (JJ solar-based)) (PRN (, ,) (S (VP (VBG relying) (PP (IN on) (NP (DT the) (NN fact)))))) (SBAR (IN that) (S (NP (NP (DT every) (NN year)) (, ,) (NP (DT the) (NN earth))) (VP (VBZ completes) (NP (NP (CD one) (NN revolution)) (PP (IN around) (NP (DT the) (NN sun)))) (PP (IN after) (NP (CD 365.25) (NNS days))))))) (. .)))
The Gregorian Calendar is solar-based, relying on the fact that every year, the earth completes one revolution around the sun after 365.25 days.
(ROOT (S (NP (NNP Earth)) (VP (VBZ makes) (NP (DT a) (JJ complete) (NN revolution)) (NP (ADVP (IN around) (NP (DT the) (NN sun)) (PP (IN about) (ADVP (RB once)))) (DT every) (NN year))) (. .)))