Earlier observations of the Moon were made only at conjunction or at opposition to the Sun and it was these earlier observations on which Newton 's lunar theory had been based. However, Halley has been criticised for his work as Astronomer Royal.
Mas maaga ng mga obserbasyon ng Buwan ay ginawa lamang at kaugnay o sa oposisyon sa Linggo at ito ay mas maaga ang mga ito sa obserbasyon na Newton 's buwan theory had been based. Gayunman, Halley ay criticised para sa kanyang trabaho bilang Astronomer Royal.