Of the few pieces of work done by Harriot after 1614, one was his observation of another comet in 1618 (there were three visible comets that year and Harriot observed the third) from Syon House.
Ng ilang piraso ng trabahong isinagawa sa pamamagitan ng Harriot matapos ang 1614, ang isa ay ang kanyang observation ng isa pang kometa sa 1618 (doon ay makikita comets na tatlong taon at Harriot napagmasdan ang ikatlong) mula sa Syon House.