when was halley's comet discovered

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was halley's comet discovered	0.11	1	5591	59	34
when	1.28	0.2	5208	76	4
was	1.82	0.7	3075	49	3
halley's	1.92	0.9	5569	93	8
comet	1.36	0.5	4467	42	5
discovered	0.27	0.1	4408	96	10

Keyword	CPC	PCC	Volume	Score
when was halley's comet discovered	0.73	0.7	5402	50
when was halley's comet first discovered	1.23	0.8	889	99
when was halley's comet	0.76	0.5	903	73
when was halley's comet named	1.19	0.1	4347	31
what year was halley's comet	1.81	0.8	9602	12
the comet known as halley's comet history	0.3	0.2	8040	1
halley's comet dates in history	0.63	0.2	1869	85
the comet known as halley's discovery	1.84	0.8	815	30
earliest record of halley's comet	0.93	1	1395	1
halley's comet historical dates	0.59	0.5	9098	13
the comet known as halley's history	0.61	0.7	9101	52
did halley's comet appear in 1910	1.21	0.2	6427	39