yes
quadrant
a quadrant
a star diagram is a circle on which we plot the location of stars the circle represents the sky above and it is divided into 4 quadrants while knowing the northerly direction we plot the stars with respect to its location from true north and we tabulate its declination in a separate column since location of stars for a particular time from a particular geographical position is predictable so we match it and obtain own position in terms of latitude and longitude
The main sequence phase means that, if you plot an H-R (Hertzsprung-Russel) diagram, it is in the so-called "main sequence", the area in the graph where you find the majority of stars. Those are the stars that currently fuse hydrogen into helium.
Its the plot that charts things for Apollo 13 mission
quadrant
a quadrant
a quadrant
plot the ships position
plot the ships position
k+c I+J