The time before night when it is not yet dark-

• Dusk:
- the time before night when it is not yet dark.
- সন্ধ্যার প্রাক্কাল; গোধূলি; আংশিক অন্ধকার রঙের কালচে ভাব।
 
• Evening (সন্ধ্যাকাল)
- the part of the day between the afternoon and the time you go to bed

• Dawn (ঊষা; ভোর)
- the time of day when light first appears

• Eclipse (গ্রহণ)
- an occasion when the moon passes between the earth and the sun so that you cannot see all or part of the sun for a time;
- an occasion when the earth passes between the moon and the sun so that you cannot see all or part of the moon for a time
 
Source: Oxford Dictionary