anyone heard of tradition of starting voyages on new moon

[raaaid]

i ask because you can do this in that case:

nomad started voyage exactly on new moon when the angle between sun and moon is zero degrees

along the voyage they would count sunsets and exactly on the 28th sunset they would measure the angle between sun and moon

if the angle was 10º it meant they have travelled 5º of longitude

so anyone heard of songs or folklore sying on starting a voyage on new moon?