I have done an extensive research and I am aware that Sun and Earth can be ordinary and proper nouns depending on the context. I am writing the engineering text, which is also concerned with transfer of energy and light between Earth/earth and Sun/sun.
I initially used capitalised forms, Sun and Earth. I gave my text for editing, and curiously, the editor changed Sun to sun and left Earth intact. So what I got in the end is something like that
A typical example of heat transfer by radiation occurs between the sun and the Earth.
This looks a bit inconsistent to me. What would you suggest?
Would it be OK if I put both Earth and Sun to uncapitalised form?
Thanks for the advices.
EDIT: this might be interesting:
- Serway's textbook consistently use Sun and Earth,
- Incropera's textbook consistently use sun, while earth in used in about 90% of cases.
They both seem to be pretty consistent to me.