CREATE TABLE table_60681 ("HD designation" TEXT, "Constellation" TEXT, "Distance  (  ly  ) " FLOAT, "Spectral type" TEXT, "Signal power  (  kW  ) " FLOAT, "Date sent" TEXT, "Arrival date" TEXT)

What is Date, when Constellation is 'Delphinus'?
SELECT "Date sent" FROM table_60681 WHERE "Constellation" = 'delphinus'
SELECT "Date sent" FROM "table_60681" WHERE "Constellation" = 'delphinus'