This is a creative translation because literal translation wouldn't look good

Orange - नारंगी (in hindi)
Sunset- सूर्यास्त (in hindi)

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Note added at 58 mins (2020-05-18 16:01:17 GMT)
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सुबह-शाम आकाश का रंग लाल नारंगी क्यों हो जाता है?
https://youtu.be/qVzwGrZ8Q8E

Colour names in Hindi and English
https://youtu.be/QBQcsdw1BWM



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Note added at 1 hr (2020-05-18 16:08:30 GMT)
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Can also be said like this:
अस्त होते हुए सूर्य की लाली/ संध्या की लाली

If you can afford to exercise some sort of liberty, you may also consider using it, particularly when you are required to translate the lyrics in classical, pure Hindi.


तूफानी दिनों में भी, रात के खाने के वक्त से पहले ही बादल छंट जाते और फिर रक्तिम सूर्यास्त होता।
https://books.google.co.in/books?id=xgiUDwAAQBAJ&pg=PT221&lp...

मेरी वह भूमि है
महाबाहु ब्रह्मपुत्र का
जहाँ की रक्तिम सूर्यास्त
पिघला दें दिलों को
एक फैला हुआ इतिहास
समानता की सहज समाज का
प्रभूत वन्य जीव..
और चार ऋतुओं के संग।
https://www.facebook.com/BobitaHkDebnath/photos/वही-मेरी-भूम...

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Note added at 1 hr (2020-05-18 16:46:11 GMT)
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Thanks for your note herein below. It is always advisable to give the context and info about the target readers. Yes, I think your suggestion is fine.

Simple and easy option. नारंगी सूरज does not sound proper. In Hindi, we usually hear लाल सूरज

I think, as per short description, it looks like it belongs to some kind of jingle or positive punch lines, so creativity is a must. Second, practically literal and dialect use won't work here. It needs some sort of wordplay, so the orange best replicates with "सुनहरा" in terms of practical Hindi use. Quotes like "सुनहरी शाम का साथी" or something like it best fit.