Perhaps his most important contribution was in his efforts to set up the Royal Observatory at Greenwich and his efforts to support Flamsteed . In 1674 he invited Flamsteed to London, see:
Marahil na ang kanyang pinakamahalagang kontribusyon ay sa kanyang mga pagsisikap upang i-set up ang Royal obserbatoryo sa Greenwich at ang kanyang mga pagsisikap sa suporta Flamsteed. 1674 Inanyayahan siya sa Flamsteed sa London, tingnan ang: