Input (grade 3): From Remus, the inner moon, Sylvia appears huge, roughly 30 Â Ã - 18 Â across, while its view of Romulus varies between 1.59 and 0.50 Â across.
Output (grade 2): From Remus, the closer moon, Sylvia appears very big, about 30 Â Ã - 18 Â across, while its view of Romulus varies between 1.59 and 0.50 Â across.