The is the region of a shadow where some light falls
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ᴛʜᴇ ᴜᴍʙʀᴀ (ʟᴀᴛɪɴ ғᴏʀ "sʜᴀᴅᴏᴡ") ɪs ᴛʜᴇ ɪɴɴᴇʀᴍᴏsᴛ ᴀɴᴅ ᴅᴀʀᴋᴇsᴛ ᴘᴀʀᴛ ᴏғ ᴀ sʜᴀᴅᴏᴡ, ᴡʜᴇʀᴇ ᴛʜᴇ ʟɪɢʜᴛ sᴏᴜʀᴄᴇ ɪs ᴄᴏᴍᴘʟᴇᴛᴇʟʏ ʙʟᴏᴄᴋᴇᴅ ʙʏ ᴛʜᴇ ᴏᴄᴄʟᴜᴅɪɴɢ ʙᴏᴅʏ. ᴀɴ ᴏʙsᴇʀᴠᴇʀ ᴡɪᴛʜɪɴ ᴛʜᴇ ᴜᴍʙʀᴀ ᴇxᴘᴇʀɪᴇɴᴄᴇs ᴀ ᴛᴏᴛᴀʟ ᴇᴄʟɪᴘsᴇ. ᴛʜᴇ ᴜᴍʙʀᴀ ᴏғ ᴀ ʀᴏᴜɴᴅ ʙᴏᴅʏ ᴏᴄᴄʟᴜᴅɪɴɢ ᴀ ʀᴏᴜɴᴅ ʟɪɢʜᴛ sᴏᴜʀᴄᴇ ғᴏʀᴍs ᴀ ʀɪɢʜᴛ ᴄɪʀᴄᴜʟᴀʀ ᴄᴏɴᴇ.
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