Observe means to look or see When studying in a scientific field, it usually means to look carefully.
I saw nothing. This question can be handled better by someone who was there and actually saw it.
The Cichen Itza culture had two different calendars. One has three hundred five days the other had two hundred and sixty days and when a day on both calendars came together they consider that a season.
Because of space travel, we can watch TV,use cellphones,use maps,see weather,explore our solar system,win wars,obsreve oceans,obsreve lands,observe animals,observe stars,find lost people and animals,discover about our Universe. Satellites placed in our solar system have allowed humans to enjoy the luxuries of telvision, cell phones, and other electronics.