These are the most frequently used words in this book.
0
across
ages
almost
astronomer
astronomical
best
better
between
black
camera
conditions
contact
day
diameter
disk
distance
down
during
earth
eclipse
egress
enough
equipment
even
expedition
eye
eyepiece
far
figure
film
filters
first
get
good
halley
hours
image
ingress
jupiter
large
less
light
limb
long
may
mean
mercury
miles
minutes
mirror
moon
must
new
next
nov
now
object
observations
observatory
observed
observers
observing
orbit
part
place
planet
point
possible
quite
results
satellites
screen
seconds
see
seems
seen
set
shadow
should
site
size
sky
small
solar
still
sun
table
take
telescope
thing
though
time
transit
two
use
used
venus
work
years