1- a situation when you waited for a bus or a train 2- a challenging profession you know about

Describe a science subject that you learned in high school.

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I learnt a lot from the course. The subject had several books - one of them was 
used as the main textbook while the two other associated books were 
prescribed for earning further knowledge on space. The notable things I learnt 
from the subject are – I can figure out the stars with their names, I can 
determine directions at night times without any compass, I know a good 
number of information about the solar system and the surrounding planets of 
the Earth. Being informed about the information of the surrounding planets 
and the internal conditions, I was greatly surprised. Besides, before attending 
the class, I was unaware of the names of the stars, their positions, how they 
changed with the passage of time, how they are linked with mythological 
characters etc. and when I completed the course, I was amazed about them. 
The entire universe and the other galaxies like us, potentials of life etc. made 
me excited. 
Initially, I could not apply the knowledge in my real life until I went to an 
adventure on the sea. In fact, the adventure was not that much planned and 
happened all on a sudden. A couple of my friend planned to have a trip to the 
beach and then suddenly we experienced a low storm which took us to a 
nearby island. Since this was not a planned sea voyage, we did not have the 
right tools with us to survive on the sea. We lost the directions of the 
mainland. I applied my knowledge of stars to determine the direction to the 
mainland and finally reached there after lots of struggle. If I did not have the 
knowledge of figuring direction with stars, something worse might have 
happened.