Possible Clues:

• The horizon is this, to the best of my understanding (2,3,2,1,3,3)
• That's my view (to the extent that 13 may allow) (2,3,2,1,3,3)
• 'Based on what they tell me ... '
• "Based on what they tell me ... "
• The horizon may be this, according to my understanding? (2,3,2,1,3,3)
• To the best of my understanding, it's the horizon on a clear day? (2,3,2,1,3,3)
• The faintest star is this, to my knowledge (2,3,2,1,3,3)
• To the best of my knowledge, that could be the horizon (2,3,2,1,3,3)
• It's the horizon according to my judgement (2,3,2,1,3,3)