| http://www.w3.org/ns/prov#value | - It may be sporadic and simply escaped recording (which was quite hit or miss before modern times).There are many showers that were reported for the first time in recent history with no record of prior observation (e.g. the Quadrantids, never noted before 1825).With showers such as the one you cited, we were able to extrapolate back and recognize that they had in fact crossed our path in the past,
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