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May
June
August
September
October
November
December

1- May-1998	India and Peru sign agreements on space technology and agriculture during the visit of Indian President K. R. Narayanan there.
11- May-1998	Three momentous events took place on the day that did the nation proud. Firstly, three underground nuclear tests at Pokhran Range in Rajasthan, which included a hydrogen bomb, were tested; secondly, the successful test firing of the 'Trishul Missile' and thirdly, the maiden Certification test flight of 'Hansa-3', the first-all Composite indigenous two seater aircraft.
13- May-1998	India carries out two more nuclear tests at Pokharan in Rajasthan.
13- May-1998	India conducts two more nuclear tests at Pokhran. The US slaps sanctions. The Prime Minister says India will face down sanctions.
26- May-1998	S. Chandrasekar, scientist, was selected for the Niels Bohr-UNESCO gold medal.