There are so many different layers of animal care that might not be obvious to the casual observer.
To be up there in the cold and the dark, riding in the observer's cage and carefully.
Surveying the serried ranks of people, one observer said they were jammed so closely.
And so, rock climbing is not really mind over matter, even if it looks that way to the admiring observer.
These compact systems allow scientists to study animal behavior without interference by a human observer.
If you're aware of it-if you're an observer-you do notice these things along the way.
As a result, a clock speeding away from an observer will appear to tick slower than a stationary clock.
But many of my visual observer friends tell me it didn't look much different from any other full moon.
Their faint marks reveal themselves only to the careful observer.
Gravitation naturally does not exist for this observer.
British Dictionary definitions for observer
observer
/əbˈzɜːvə/
noun
1.
a person or thing that observes
2.
a person who attends a conference solely to note the proceedings
3.
a person trained to identify aircraft, esp, formerly, a member of an aircrew
Word Origin and History for observer
n.
1550s, "one who keeps a rule, custom, etc.," agent noun from observe. Meaning "one who watches and takes notice" is from 1580s; this is the sense of the word in many newspaper names.