when was halley comet discovered

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was halley comet discovered	1.14	0.2	2719	9	32
when	0.14	0.3	5008	25	4
was	0.52	0.2	292	30	3
halley	1.01	0.4	2860	25	6
comet	0.68	0.2	5038	77	5
discovered	0.93	0.8	2126	11	10

Keyword	CPC	PCC	Volume	Score
when was halley comet discovered	1.79	0.6	1454	74
who discovered comet halley	1.13	0.5	1442	28
when was halley's comet	1.92	0.7	1765	64
when was halley's comet named	0.43	0.7	7931	24
the comet known as halley's comet discovery	0.71	0.4	879	76
the comet known as halley's comet history	1.34	0.2	8202	20
what year was halley's comet	1.99	0.6	6052	4
history of halley's comet	1.01	0.9	2656	39
the comet known as halley's discovery	1.59	0.8	6027	25
earliest record of halley's comet	0.58	0.3	1442	44
the comet known as halley's history	0.09	0.4	7966	31
halley's comet dates in history	1.67	0.6	7778	81
halley's comet historical dates	1.44	1	3222	31
who named halley's comet	0.53	0.3	6965	48